1
|
Chung KY, Uddin A, Page ZA. Record release of tetramethylguanidine using a green light activated photocage for rapid synthesis of soft materials. Chem Sci 2023; 14:10736-10743. [PMID: 37829029 PMCID: PMC10566505 DOI: 10.1039/d3sc04130a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 09/06/2023] [Indexed: 10/14/2023] Open
Abstract
Photocages have enabled spatiotemporally governed organic materials synthesis with applications ranging from tissue engineering to soft robotics. However, the reliance on high energy UV light to drive an often inefficient uncaging process limits their utility. These hurdles are particularly evident for more reactive cargo, such as strong organobases, despite their attractive potential to catalyze a range of chemical transformations. Herein, two metal-free boron dipyrromethene (BODIPY) photocages bearing tetramethylguanidine (TMG) cargo are shown to induce rapid and efficient polymerizations upon exposure to a low intensity green LED. A suite of spectroscopic characterization tools were employed to identify the underlying uncaging and polymerization mechanisms, while also determining reaction quantum efficiencies. The results are directly compared to state-of-the-art TMG-bearing ortho-nitrobenzyl and coumainylmethyl photocages, finding that the present BODIPY derivatives enable step-growth polymerizations that are >10× faster than the next best performing photocage. As a final demonstration, the inherent multifunctionality of the present BODIPY platform in releasing radicals from one half of the molecule and TMG from the other is leveraged to prepare polymers with starkly disparate physical properties. The present findings are anticipated to enable new applications of photocages in both small-molecule photochemistry for medicine and advanced manufacturing of next generation soft materials.
Collapse
Affiliation(s)
- Kun-You Chung
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| | - Ain Uddin
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| | - Zachariah A Page
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| |
Collapse
|
2
|
Chung KY, Page ZA. Boron-Methylated Dipyrromethene as a Green Light Activated Type I Photoinitiator for Rapid Radical Polymerizations. J Am Chem Soc 2023; 145:17912-17918. [PMID: 37540781 DOI: 10.1021/jacs.3c05373] [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: 08/06/2023]
Abstract
Unimolecular (Type I) radical photoinitiators (PIs) have transformed the chemical manufacturing industry by enabling (stereo)lithography for microelectronics and emergent 3D printing technologies. However, the reliance on high energy UV-violet light (≤420 nm) restricts the end-use applications. Herein, boron-methylated dipyrromethene (methylated-BODIPY) is shown to act as a highly efficient Type I radical PI upon irradiation with low energy green light. Using a low intensity (∼4 mW/cm2) light emitting diode centered at 530 nm and a low PI concentration (0.3 mol %), acrylic-based resins were polymerized to maximum conversion in ∼10 s. Under equivalent conditions (wavelength, intensity, and PI concentration), state-of-the-art visible light PIs Ivocerin and Irgacure 784 show no appreciable polymerization. Spectroscopic characterization suggests that homolytic β-scission at the boron-carbon bond results in radical formation, which is further facilitated by accessing long-lived triplet excited states through installment of bromine. Alkylated-BODIPYs represent a new modular visible light PI platform with exciting potential to enable next generation manufacturing and biomedical applications where a spectrally discrete, low energy, and thus benign light source is required.
Collapse
Affiliation(s)
- Kun-You Chung
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Zachariah A Page
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| |
Collapse
|
3
|
Chung KY, Halwachs KN, Lu P, Sun K, Silva HA, Rosales AM, Page ZA. Rapid hydrogel formation via tandem visible light photouncaging and bioorthogonal ligation. Cell Rep Phys Sci 2022; 3:101185. [PMID: 37496708 PMCID: PMC10370463 DOI: 10.1016/j.xcrp.2022.101185] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
The formation of benign polymer scaffolds in water using green-light-reactive photocages is described. These efforts pave an avenue toward the fabrication of synthetic scaffolds that can facilitate the study of cellular events for disease diagnosis and treatment. First, a series of boron dipyrromethene (BODIPY) photocages with nitrogen-containing nucleophiles were examined to determine structure-reactivity relationships, which resulted in a >1,000× increase in uncaging yield. Subsequently, photoinduced hydrogel formation in 90 wt % water was accomplished via biorthogonal carbonyl condensation using hydrophilic polymer scaffolds separately containing BODIPY photocages and ortho-phthalaldehyde (OPA) moieties. Spatiotemporal control is demonstrated with light on/off experiments to modulate gel stiffness and masking to provide <100 μm features. Biocompatability of the method was shown through pre-/post-crosslinking cell viability studies. Short term, these studies are anticipated to guide translation to emergent additive manufacturing technology, which, longer term, will enable the development of 3D cell cultures for tissue engineering applications.
Collapse
Affiliation(s)
- Kun-You Chung
- Department of Chemistry, The University of Texas at Austin; Austin, TX 78712, USA
| | - Kathleen N. Halwachs
- McKetta Department of Chemical Engineering, The University of Texas at Austin; Austin, TX 78712, USA
| | - Pengtao Lu
- Department of Chemistry, The University of Texas at Austin; Austin, TX 78712, USA
| | - Kaihong Sun
- Department of Chemistry, The University of Texas at Austin; Austin, TX 78712, USA
| | - Hope A. Silva
- Department of Chemistry, The University of Texas at Austin; Austin, TX 78712, USA
| | - Adrianne M. Rosales
- McKetta Department of Chemical Engineering, The University of Texas at Austin; Austin, TX 78712, USA
| | - Zachariah A. Page
- Department of Chemistry, The University of Texas at Austin; Austin, TX 78712, USA
- Lead contact
| |
Collapse
|
4
|
Abstract
The present review provides both a summary and outlook on the exciting field of BODIPYs in polymer chemistry.
Collapse
Affiliation(s)
- Pengtao Lu
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | - Kun-You Chung
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | - Alex Stafford
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | - Meghan Kiker
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | - Kristina Kafle
- Department of Chemistry
- The University of Texas at Austin
- Austin
- USA
| | | |
Collapse
|
5
|
Li MML, Chung KY, Ng AWH, Chiu KH. Progressive diaphyseal dysplasia: a rare bone disorder with alarming radiographs. Hong Kong Med J 2020; 26:538.e1-538.e3. [PMID: 33350969 DOI: 10.12809/hkmj208498] [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: 11/05/2022] Open
Affiliation(s)
- M M L Li
- Department of Orthopaedics and Traumatology, Prince of Wales Hospital, Hong Kong
| | - K Y Chung
- Department of Orthopaedics and Traumatology, Prince of Wales Hospital, Hong Kong
| | - A W H Ng
- Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Hong Kong
| | - K H Chiu
- Department of Orthopaedics and Traumatology, Prince of Wales Hospital, Hong Kong
| |
Collapse
|
6
|
Stafford A, Ahn D, Raulerson EK, Chung KY, Sun K, Cadena DM, Forrister EM, Yost SR, Roberts ST, Page ZA. Catalyst Halogenation Enables Rapid and Efficient Polymerizations with Visible to Far-Red Light. J Am Chem Soc 2020; 142:14733-14742. [DOI: 10.1021/jacs.0c07136] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
7
|
Lee S, Chu YS, Yoo SK, Choi S, Choe SJ, Koh SB, Chung KY, Xing L, Oh B, Yang S. Augmented decision-making for acral lentiginous melanoma detection using deep convolutional neural networks. J Eur Acad Dermatol Venereol 2020; 34:1842-1850. [PMID: 31919901 DOI: 10.1111/jdv.16185] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 12/13/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND Several studies have achieved high-level performance of melanoma detection using convolutional neural networks (CNNs). However, few have described the extent to which the implementation of CNNs improves the diagnostic performance of the physicians. OBJECTIVE This study is aimed at developing a CNN for detecting acral lentiginous melanoma (ALM) and investigating whether its implementation can improve the initial decision for ALM detection made by the physicians. METHODS A CNN was trained using 1072 dermoscopic images of acral benign nevi, ALM and intermediate tumours. To investigate whether the implementation of CNN can improve the initial decision for ALM detection, 60 physicians completed a three-stage survey. In Stage I, they were asked for their decisions solely on the basis of dermoscopic images provided to them. In Stage II, they were also provided with clinical information. In Stage III, they were provided with the additional diagnosis and probability predicted by the CNN. RESULTS The accuracy of ALM detection in the participants was 74.7% (95% confidence interval [CI], 72.6-76.8%) in Stage I and 79.0% (95% CI, 76.7-81.2%) in Stage II. In Stage III, it was 86.9% (95% CI, 85.3-88.4%), which exceeds the accuracy delivered in Stage I by 12.2%p (95% CI, 10.1-14.3%p) and Stage II by 7.9%p (95% CI, 6.0-9.9%p). Moreover, the concordance between the participants considerably increased (Fleiss-κ of 0.436 [95% CI, 0.437-0.573] in Stage I, 0.506 [95% CI, 0.621-0.749] in Stage II and 0.684 [95% CI, 0.621-0.749] in Stage III). CONCLUSIONS Augmented decision-making improved the performance of and concordance between the clinical decisions of a diverse group of experts. This study demonstrates the potential use of CNNs as an adjoining, decision-supporting system for physicians' decisions.
Collapse
Affiliation(s)
- S Lee
- Department of Dermatology, Yonsei University Wonju College of Medicine, Wonju, Korea.,Department of Preventive Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Y S Chu
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| | - S K Yoo
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| | - S Choi
- Department of Dermatology and Cutaneous Biology Research Institute, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - S J Choe
- Department of Dermatology, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - S B Koh
- Department of Preventive Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - K Y Chung
- Department of Dermatology and Cutaneous Biology Research Institute, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - L Xing
- Department of Radiation Oncology, Stanford University, Stanford, CA, USA
| | - B Oh
- Department of Dermatology and Cutaneous Biology Research Institute, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - S Yang
- Department of Biomedical Engineering, Yonsei University, Wonju, Korea
| |
Collapse
|
8
|
Sivchik V, Sarker RK, Liu ZY, Chung KY, Grachova EV, Karttunen AJ, Chou PT, Koshevoy IO. Improvement of the Photophysical Performance of Platinum-Cyclometalated Complexes in Halogen-Bonded Adducts. Chemistry 2018; 24:11475-11484. [PMID: 29874401 DOI: 10.1002/chem.201802182] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [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: 05/02/2018] [Indexed: 01/28/2023]
Abstract
Three groups of luminescent platinum complexes [Pt(C^N)(L)(Y)] [C^N=benzothienyl-pyridine (1), bezofuryl-pyridine (2), phenyl-pyridine (3); L/Y=DMSO/Cl (a), PPh3 /Cl (b), PPh3 /CN (c)] have been probed as halogen-bond (XB) acceptors towards iodofluorobenzenes (IC6 F5 and I2 C6 F4 ). Compounds 1 a and 2 a (L/Y=DMSO/Cl) afford the adducts 1 a⋅⋅⋅I2 C6 F4 and 2 a⋅⋅⋅I2 C6 F4 , which feature I⋅⋅⋅Sbtpy /I⋅⋅⋅πbtpy and I⋅⋅⋅ODMSO /I⋅⋅⋅Cl short contacts, respectively. The phosphane-cyanide derivatives 1 c and 2 c (L/Y=PPh3 /CN) co-crystallise with both IC6 F5 and I2 C6 F4 . None of the phpy-based species 3 a-3 c participated in XB interactions. Although the native complexes are rather poor luminophores in the solid state (Φem =0.023-0.089), the adducts exhibit an up to 10-fold increase of the intensity with a minor alteration of the emission energy. The observed gain in the quantum efficiency is mainly attributed to the joint influence of non-covalent interactions (halogen/hydrogen bonding, π-π stacking), which govern the crystal-packing mode and diminish the radiationless pathways for the T1 →S0 transition by providing a rigid environment around the chromophore.
Collapse
Affiliation(s)
- Vasily Sivchik
- Department of Chemistry, University of Eastern Finland, 80101, Joensuu, Finland
| | - Rajib Kumar Sarker
- Department of Chemistry, University of Eastern Finland, 80101, Joensuu, Finland
| | - Zong-Ying Liu
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Kun-You Chung
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Elena V Grachova
- Institute of Chemistry, St.-Petersburg State University, 26 Universitetskiy pr., Petergof, St.-Petersburg, Russia
| | - Antti J Karttunen
- Department of Chemistry and Materials Science, Aalto University, FI-00076, Aalto, Finland
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan
| | - Igor O Koshevoy
- Department of Chemistry, University of Eastern Finland, 80101, Joensuu, Finland
| |
Collapse
|
9
|
Roh MR, Kumar R, Rajadurai A, Njauw C, Ryoo UH, Chung KY, Tsao H. Beta-catenin causes fibrotic changes in the extracellular matrix via upregulation of collagen I transcription. Br J Dermatol 2017; 177:312-315. [PMID: 27639179 DOI: 10.1111/bjd.15079] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- M R Roh
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, U.S.A.,Department of Dermatology, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - R Kumar
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, U.S.A
| | - A Rajadurai
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, U.S.A
| | - C Njauw
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, U.S.A
| | - U H Ryoo
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - K Y Chung
- Department of Dermatology, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - H Tsao
- Wellman Center for Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, U.S.A
| |
Collapse
|
10
|
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
| |
Collapse
|
11
|
Chung KY, Chen YH, Chen YT, Hsu YH, Shen JY, Chen CL, Chen YA, Chou PT. The Excited-State Triple Proton Transfer Reaction of 2,6-Diazaindoles and 2,6-Diazatryptophan in Aqueous Solution. J Am Chem Soc 2017; 139:6396-6402. [DOI: 10.1021/jacs.7b01672] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Kun-You Chung
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Yi-Han Chen
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Yi-Ting Chen
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Yen-Hao Hsu
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Jiun-Yi Shen
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Chi-Lin Chen
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Yi-An Chen
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| | - Pi-Tai Chou
- Department of Chemistry and
Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan, R.O.C
| |
Collapse
|
12
|
Smith ZK, Chung KY, Parr SL, Johnson BJ. Anabolic payout of terminal implant alters adipogenic gene expression of the longissimus muscle in beef steers. J Anim Sci 2017; 95:1197-1204. [PMID: 28380538 DOI: 10.2527/jas.2016.0630] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This experiment evaluated the dose and payout pattern of trenbolone acetate (TBA) and estradiol-17β (E) on LM mRNA expression of adenosine monophosphate-activated protein kinase-ɑ (-ɑ), β, G protein-coupled receptor 41(), G protein-coupled receptor 43 (), γ, and stearoyl CoA desaturase () in finishing feedlot steers as indicators of adipogenesis and marbling development. British × Continental steers (n = 168; 14 pens/treatment; initial BW = 362 kg) were used in a randomized complete block design. Treatments included: no implant (NI), Revalor-S (REV-S; 120 mg TBA + 24 mg E), or Revalor-XS (REV-X; delayed release implant: 80 mg TBA + 16 mg E [uncoated], 120 mg TBA + 24 mg E [coated], 200 mg TBA + 40 mg E [total]). Steers were fed 1 time daily for an average of 164 d. The LM biopsies were collected (1 steer/pen) on d -1, 27, 55, and 111 relative to timing of implant. Total RNA was isolated from each sample and real-time quantitative PCR was used to measure quantity of -ɑ, β, , ,it, γ, and mRNA. No implant × day interactions were detected ( ≥ 0.19) in this experiment. Day impacted the mRNA expression of all adipogenic genes ( ≤ 0.02). The main effect of implant tended ( = 0.09) to influence expression of -ɑ, REV-X had an 8.8% increase over NI and an 18.7% increase over REV-S. Implant influenced ( = 0.03) mRNA expression of , expression of for the REV-X treatment was not different ( > 0.10) from NI, and both were greater ( ≤ 0.05) than REV-S (1.13, 1.00, and 0.67 ± 0.224 arbitrary units) for REV-X, NI, and REV-S, respectively. Implant also influenced ( = 0.02) expression of , expression of for REV-X was not different ( > 0.10) from NI, and both were greater ( ≤ 0.05) than REV-S (1.27, 1.07, and 0.72 ± 0.234 arbitrary units) for REV-X, NI, and REV-S, respectively. Implant influenced ( = 0.02) mRNA expression of γ in LM tissue, expression of γ for REV-X was not different ( > 0.10) from NI, and both were greater ( ≤ 0.05) than REV-S (1.09, 1.02, and 0.69 ± 0.195 arbitrary units) for REV-X, NI, and REV-S, respectively. The REV-X steers received the greatest anabolic dose of TBA + E without detriment to marbling scores. The increased mRNA expression of adipogenic genes for REV-X steers suggest that the delayed and gradual release of anabolic stimulants associated with REV-X might have mitigated decreases in marbling generally attributed to multiple combined TBA + E implants.
Collapse
|
13
|
Schneider L, Sivchik V, Chung KY, Chen YT, Karttunen AJ, Chou PT, Koshevoy IO. Cyclometalated Platinum(II) Cyanometallates: Luminescent Blocks for Coordination Self-Assembly. Inorg Chem 2017; 56:4460-4468. [PMID: 28358479 DOI: 10.1021/acs.inorgchem.7b00006] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A family of cyanide-bridged heterometallic aggregates has been constructed of the chromophoric cycloplatinated metalloligands and coordinatively unsaturated d10 fragments {M(PPh3)n}. The tetranuclear complexes of general composition [Pt(C^N)(CN)2M(PPh3)2]2 [C^N = ppy, M = Cu (1), Ag (2); C^N = tolpy (Htolpy = 2-(4-tolyl)-pyridine), M = Cu (4), Ag (5); C^N = F2ppy (HF2ppy = 2-(4, 6-difluorophenyl)-pyridine), M = Cu (7), Ag (8)] demonstrate a squarelike arrangement of the molecular frameworks, which is achieved due to favorable coordination geometries of the bridging ligands and the metal ions. Variation of the amount of the ancillary phosphine (for M = Ag) afforded compounds [Pt(C^N)(CN)2Ag(PPh3)]2 (C^N = ppy, 3; C^N = tolpy, 6); for the latter one an alternative cluster topology, stabilized by the Pt-Ag metallophilic and η1-Cipso(C^N)-Ag bonding, was observed. The solid-state structures of all of the title species 1-8 were determined crystallographically. The complexes exhibit moderately strong room-temperature phosphorescence as crystalline powders (Φem = 16-34%, λem = 470-511 nm). The luminescence studies and time-dependent density functional theory computational analysis indicate that the photophysical behavior is dominated by the 3π-π* electronic transitions localized on the cyclometalated fragment and mixed with MPtLCT contribution, while the d10-phosphine motifs have a negligible contribution into the frontier orbitals and therefore show a little influence on the emission performance of the described compounds.
Collapse
Affiliation(s)
- Leon Schneider
- Institut für Anorganische Chemie, Julius-Maximilians-Universität , Würzburg, Germany.,Department of Chemistry, University of Eastern Finland , 80101 Joensuu, Finland
| | - Vasily Sivchik
- Department of Chemistry, University of Eastern Finland , 80101 Joensuu, Finland
| | - Kun-You Chung
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Yi-Ting Chen
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | | | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
| | - Igor O Koshevoy
- Department of Chemistry, University of Eastern Finland , 80101 Joensuu, Finland
| |
Collapse
|
14
|
Huang CH, Wu PJ, Chung KY, Chen YA, Li EY, Chou PT. Room-temperature phosphorescence from small organic systems containing a thiocarbonyl moiety. Phys Chem Chem Phys 2017; 19:8896-8901. [DOI: 10.1039/c7cp00074j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Room-temperature phosphorescence facilitated by the thiocarbonyl group in dTPT3-based derivatives.
Collapse
Affiliation(s)
- Chun-Hao Huang
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Pei-Jhen Wu
- Department of Chemistry and Center for Emerging Material and Advanced Devices
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Kun-You Chung
- Department of Chemistry and Center for Emerging Material and Advanced Devices
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Yi-An Chen
- Department of Chemistry and Center for Emerging Material and Advanced Devices
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Elise Y. Li
- Department of Chemistry
- National Taiwan Normal University
- Taipei
- Taiwan
| | - Pi-Tai Chou
- Department of Chemistry and Center for Emerging Material and Advanced Devices
- National Taiwan University
- Taipei 10617
- Taiwan
| |
Collapse
|
15
|
Chen YA, Meng FY, Hsu YH, Hung CH, Chen CL, Chung KY, Tang WF, Hung WY, Chou PT. N−H-Type Excited-State Proton Transfer in Compounds Possessing a Seven-Membered-Ring Intramolecular Hydrogen Bond. Chemistry 2016; 22:14688-95. [DOI: 10.1002/chem.201602425] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Yi-An Chen
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| | - Fan-Yi Meng
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| | - Yen-Hao Hsu
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| | - Cheng-Hsien Hung
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| | - Chi-Lin Chen
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| | - Kun-You Chung
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| | - Wei-Feng Tang
- Institute of Optoelectronic Sciences; National Taiwan Ocean University; Keelung 20224 Taiwan R.O.C
| | - Wen-Yi Hung
- Institute of Optoelectronic Sciences; National Taiwan Ocean University; Keelung 20224 Taiwan R.O.C
| | - Pi-Tai Chou
- Department of Chemistry; Center for Emerging Material and Advanced Devices; National Taiwan University; Taipei 10617 Taiwan R.O.C
| |
Collapse
|
16
|
Affiliation(s)
- J Y Kim
- 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
| | - W-J Kim
- Department of Dermatology, Busan St. Mary's Hospital, Busan, Korea
| | - S Y Jung
- Department of Dermatology, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea
| |
Collapse
|
17
|
Kondrasenko I, Tsai ZH, Chung KY, Chen YT, Ershova YY, Doménech-Carbó A, Hung WY, Chou PT, Karttunen AJ, Koshevoy IO. Ambipolar Phosphine Derivatives to Attain True Blue OLEDs with 6.5% EQE. ACS Appl Mater Interfaces 2016; 8:10968-10976. [PMID: 27100797 DOI: 10.1021/acsami.6b01041] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A family of new branched phosphine derivatives {Ph2N-(C6H4)n-}3P → E (E = O 1-3, n = 1-3; E = S 4-6, n = 1-3; E = Se 7-9, n = 1-3; E = AuC6F5 4-6, n = 1-3), which are the donor-acceptor type molecules, exhibit efficient deep blue room temperature fluorescence (λem = 403-483 nm in CH2Cl2 solution, λem = 400-469 nm in the solid state). Fine tuning the emission characteristics can be achieved varying the length of aromatic oligophenylene bridge -(C6H4)n-. The pyramidal geometry of central R3P → E fragment on the one hand disrupts π-conjugation between the branches to preserve blue luminescence and high triplet energy, while on the other hand provides amorphous materials to prevent excimer formation and fluorescence self-quenching. Hence, compounds 2, 3, 5, and 12 were used as emitters to fabricate nondoped and doped electroluminescent devices. The luminophore 2 (E = O, n = 2) demonstrates excellently balanced bipolar charge transport and good nondoped device performance with a maximum external quantum efficiency (EQEmax) of 3.3% at 250 cd/m(2) and Commission International de L'Eclairage (CIE) coordinates of (0.15, 0.08). The doped device of 3 (E = O, n = 3) shows higher efficiency (EQEmax of 6.5, 6.0 at 100 cd/m(2)) and high color purity with CIE (0.15, 0.06) that matches the HDTV standard blue. The time-resolved electroluminescence measurement indicates that high efficiency of the device can be attributed to the triplet-triplet annihilation to enhance generation of singlet excitons.
Collapse
Affiliation(s)
- Ilya Kondrasenko
- University of Eastern Finland , Department of Chemistry, Joensuu 80101, Finland
| | - Zheng-Hua Tsai
- Institute of Optoelectronic Sciences, National Taiwan Ocean University , Keelung 20224, Taiwan
| | - Kun-You Chung
- National Taiwan University , Department of Chemistry, Taipei 10617, Taiwan
| | - Yi-Ting Chen
- Soochow University , Department of Chemistry, Lin-shih Rd. 70, Shih-Lin Taipei, TW 111, Taiwan
| | - Yana Yu Ershova
- University of Eastern Finland , Department of Chemistry, Joensuu 80101, Finland
| | | | - Wen-Yi Hung
- Institute of Optoelectronic Sciences, National Taiwan Ocean University , Keelung 20224, Taiwan
| | - Pi-Tai Chou
- National Taiwan University , Department of Chemistry, Taipei 10617, Taiwan
| | | | - Igor O Koshevoy
- University of Eastern Finland , Department of Chemistry, Joensuu 80101, Finland
| |
Collapse
|
18
|
Liu BQ, Chen YT, Chen YW, Chung KY, Tsai YH, Li YJ, Chao CM, Liu KM, Tseng HW, Chou PT. Ethylene glycol modified 2-(2′-aminophenyl)benzothiazoles at the amino site: the excited-state N-H proton transfer reactions in aqueous solution, micelles and potential application in live-cell imaging. Methods Appl Fluoresc 2016. [DOI: 10.1088/2050-6120/4/1/014004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
19
|
Seo J, Kim J, Kim SH, Oh BH, Chung KY. Malignant peripheral nerve sheath tumour arising in a scar from infantile haemangioma. Clin Exp Dermatol 2015; 41:434-6. [PMID: 26643982 DOI: 10.1111/ced.12782] [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] [Accepted: 05/25/2015] [Indexed: 11/30/2022]
Affiliation(s)
- J Seo
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Korea
| | - J Kim
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Korea
| | - S H Kim
- Department of Pathology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - B H Oh
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Korea
| | - K Y Chung
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Korea
| |
Collapse
|
20
|
Choi SH, Park SK, Johnson BJ, Chung KY, Choi CW, Kim KH, Kim WY, Smith B. AMPKα, C/EBPβ, CPT1β, GPR43, PPARγ, and SCD Gene Expression in Single- and Co-cultured Bovine Satellite Cells and Intramuscular Preadipocytes Treated with Palmitic, Stearic, Oleic, and Linoleic Acid. Asian-Australas J Anim Sci 2015; 28:411-9. [PMID: 25656188 PMCID: PMC4341087 DOI: 10.5713/ajas.14.0598] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 10/02/2014] [Accepted: 10/09/2014] [Indexed: 01/28/2023]
Abstract
We previously demonstrated that bovine subcutaneous preadipocytes promote adipogenic gene expression in muscle satellite cells in a co-culture system. Herein we hypothesize that saturated fatty acids would promote adipogenic/lipogenic gene expression, whereas mono- and polyunsaturated fatty acids would have the opposite effect. Bovine semimembranosus satellite cells (BSC) and intramuscular preadipocytes (IPA) were isolated from crossbred steers and cultured with 10% fetal bovine serum (FBS)/Dulbecco’s Modified Eagle Medium (DMEM) and 1% antibiotics during the 3-d proliferation period. After proliferation, cells were treated for 3 d with 3% horse serum/DMEM (BSC) or 5% FBS/DMEM (IPA) with antibiotics. Media also contained 10 μg/mL insulin and 10 μg/mL pioglitazone. Subsequently, differentiating BSC and IPA were cultured in their respective media with 40 μM palmitic, stearic, oleic, or linoleic acid for 4 d. Finally, BSC and IPA were single- or co-cultured for an additional 2 h. All fatty acid treatments increased (p = 0.001) carnitine palmitoyltransferase-1 beta (CPT1β) gene expression, but the increase in CPT1β gene expression was especially pronounced in IPA incubated with palmitic and stearic acid (6- to 17- fold increases). Oleic and linoleic acid decreased (p = 0.001) stearoyl-CoA desaturase (SCD) gene expression over 80% in both BSC and IPA. Conversely, palmitic and stearic acid increased SCD gene expression three fold in co-cultured in IPA, and stearic acid increased AMPKα gene expression in single- and co-cultured BSC and IPA. Consistent with our hypothesis, saturated fatty acids, especially stearic acid, promoted adipogenic and lipogenic gene expression, whereas unsaturated fatty acids decreased expression of those genes associated with fatty acid metabolism.
Collapse
Affiliation(s)
- S H Choi
- Department of Animal Science, Texas Agricultural Experiment Station, Texas A&M University, College Station, TX 77843, USA ; Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - S K Park
- Department of Food Science and Technology, Sejong University, Seoul, 143-747, Korea
| | - B J Johnson
- Department of Animal and Food Science, Texas Tech University, Lubbock, TX 79409, USA
| | - K Y Chung
- Hanwoo Research Institute, National Institute of Animal Science, RDA, 232-950, Korea
| | - C W Choi
- Department of Animal Resources, Daegu University, Gyeongsan, 712-749, Korea
| | - K H Kim
- Graduate School of International Agricultural Technology, Seoul National University, Pyeongchang 232-916, Korea . ; Institute of Green Bio Science & Technology, Seoul National University, Pyeongchang, 232-916, Korea
| | - W Y Kim
- Department of Animal Science, Chungbuk National University, Cheongju 361-763, Korea
| | - B Smith
- Department of Animal Science, Texas Agricultural Experiment Station, Texas A&M University, College Station, TX 77843, USA
| |
Collapse
|
21
|
Amaresh S, Karthikeyan K, Kim KJ, An JY, Cho SJ, Chung KY, Cho BW, Nam KW, Lee YS. Metal oxide coated lithium cobalt fluorophosphate cathode materials for lithium secondary batteries--effect of aging and temperature. J Nanosci Nanotechnol 2014; 14:7545-7552. [PMID: 25942823 DOI: 10.1166/jnn.2014.9561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Lithium cobalt fluorophosphate (Li2CoPO4F) is a promising 5 V class cathode material for lithium secondary batteries. In this study, surface coating with ZrO2 improved the electrochemical activity of Li2CoPO4F with a maximum discharge capacity of 144 mA h g(-1). The effectiveness of ZrO2 coating was evaluated using aging analysis with a commercial electrolyte, i.e., 1 M LiPF6 in EC:DMC (1:1, v/v). The metal ion dissolution was reduced to 1/8th of that observed in the non-coated Li2CoPO4F. It was found that the thin coating layer had less or no contribution to the additional resistance for the cell, both at an open circuit potential and at a fully charged state; hence, the capacity of the cell was retained over cycling. Elevated temperature aging did not affect the intrinsic property of the coated Li2CoPO4F, as observed from the complete anodic and cathodic peaks from cyclic voltammetry studies after 30 days of storage at 50 degrees C. An increase in impedance was observed for aged cells, which could be due to the thick SEI layer formed during storage. The ZrO2 coating over Li2CoPO4F was crucial for the improved performance of electrode active material at higher operating potentials of up to 5.2 V.
Collapse
|
22
|
Affiliation(s)
- H Lee
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - D S Kim
- 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
| |
Collapse
|
23
|
Parr SL, Brown TR, Ribeiro FRB, Chung KY, Hutcheson JP, Blackwell BR, Smith PN, Johnson BJ. Biological responses of beef steers to steroidal implants and zilpaterol hydrochloride. J Anim Sci 2014; 92:3348-63. [PMID: 24987078 DOI: 10.2527/jas.2013-7221] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
British × Continental steers (n = 168; 7 pens/treatment; initial BW = 362 kg) were used to evaluate the effect of dose/payout pattern of trenbolone acetate (TBA) and estradiol-17β (E2) and feeding of zilpaterol hydrochloride (ZH) on serum urea-N (SUN), NEFA, IGF-I, and E2 concentrations and LM mRNA expression of the estrogen (ER), androgen (ANR), IGF-I (IGF-IR), β1-adrenergic (β1-AR), and β2-adrenergic (β2-AR) receptors and IGF-I. A randomized complete block design was used with a 3 × 2 factorial arrangement of treatments. Main effects were implant (no implant [NI], Revalor-S [REV-S; 120 mg TBA + 24 mg E2], and Revalor-XS [REV-X; 200 mg TBA + 40 mg E2]) and ZH (0 or 8.3 mg/kg of DM for 20 d with a 3-d withdrawal). Steers were fed for 153 or 174 d. Blood was collected (2 steers/pen) at d -1, 2, 6, 13, 27, 55, 83, 111, and 131 relative to implanting; LM biopsies (1 steer/pen) were collected at d -1, 27, 55, and 111. Blood and LM samples were collected at d -1, 11, and 19 relative to ZH feeding. A greater dose of TBA + E2 in combination with ZH increased ADG and HCW in an additive manner, suggesting a different mechanism of action for ZH and steroidal implants. Implanting decreased (P < 0.05) SUN from d 2 through 131. Feeding ZH decreased (P < 0.05) SUN. Serum NEFA concentrations were not affected by implants (P = 0.44). There was a day × ZH interaction (P = 0.06) for NEFA; ZH steers had increased (P < 0.01) NEFA concentrations at d 11 of ZH feeding. Serum E2 was greater (P < 0.05) for implanted steers by d 27. Serum trenbolone-17β was greater (P < 0.05) for implanted steers by d 2 followed by a typical biphasic release rate, with a secondary peak at d 111 for REV-X (P < 0.05) implanted steers. Implanting did not affect mRNA expression of the ANR or ER, but the IGF-IR and the β1-AR and β2-AR were less (P < 0.05) for REV-S than NI at d 55 and β2-AR mRNA was less (P < 0.05) for REV-S than for REV-X. Expression of the IGF-IR and the β1-AR at d 111 was greater (P< 0.05) for REV-X than for REV-S and NI at d 111, and the β2-AR was less (P< 0.05) for REV-S than for REV-X. Feeding ZH did not affect mRNA expression of the β1-AR and β2-AR. Both implanting and feeding ZH decreased SUN, but a greater dose of TBA + E2 did not result in further decreases. In addition, feeding ZH increased serum NEFA concentrations. Metabolic changes resulting from implanting and feeding ZH may aid in explaining steer performance and carcass responses to these growth promotants.
Collapse
Affiliation(s)
- S L Parr
- Texas Tech University, Department of Animal and Food Sciences, Lubbock 79415
| | - T R Brown
- Texas Tech University, Department of Animal and Food Sciences, Lubbock 79415
| | - F R B Ribeiro
- Texas Tech University, Department of Animal and Food Sciences, Lubbock 79415
| | - K Y Chung
- Texas Tech University, Department of Animal and Food Sciences, Lubbock 79415
| | | | - B R Blackwell
- Texas Tech University, The Institute of Environmental and Human Health, Department of Environmental Toxicology, Lubbock 79409
| | - P N Smith
- Texas Tech University, The Institute of Environmental and Human Health, Department of Environmental Toxicology, Lubbock 79409
| | - B J Johnson
- Texas Tech University, Department of Animal and Food Sciences, Lubbock 79415
| |
Collapse
|
24
|
Oh BH, Lee SH, Nam KA, Lee HB, Chung KY. Comparison of negative pressure wound therapy and secondary intention healing after excision of acral lentiginous melanoma on the foot. Br J Dermatol 2013; 168:333-8. [PMID: 23362968 DOI: 10.1111/bjd.12099] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Melanoma in dark-skinned individuals often develops in an acral lentiginous fashion on the foot and wide excision usually results in a substantial defect. Various repair methods, including free flap, full-thickness skin graft and secondary intention healing (SIH), are used to repair these defects. Recently, use of negative pressure wound treatment (NPWT) has been shown to accelerate wound healing in different types of wound. OBJECTIVES To compare the functional and cosmetic results of NPWT and SIH in patients who underwent wide excision of melanomas on the foot. METHODS The wound defects of 22 patients after wide excision of melanoma on the foot were treated using SIH (n = 13) or NPWT (n = 9). RESULTS There was no significant difference in time to complete wound healing between the two groups. However, evaluation using the Vancouver Burn Scar Assessment Scale at the time of complete healing showed that the mean score of the NPWT group was significantly lower than that of the SIH group. The NPWT group also had significantly better results than the SIH group in terms of total score, vascularity and height of the scars. As for complications, no wound infection was encountered in the NPWT group, whereas eight of the 13 patients in SIH group had wound infections during the course of treatment despite frequent and meticulous aseptic dressing changes. CONCLUSIONS These results show that, despite the drawback of rather prolonged healing time, NPWT is an excellent therapeutic option for wounds after wide excision of melanoma on the foot, with acceptable functional and cosmetic outcomes.
Collapse
Affiliation(s)
- B H Oh
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | | | | | | | | |
Collapse
|
25
|
Karthikeyan K, Amaresh S, Kim KJ, Kim SH, Chung KY, Cho BW, Lee YS. A high performance hybrid capacitor with Li2CoPO4F cathode and activated carbon anode. Nanoscale 2013; 5:5958-5964. [PMID: 23708774 DOI: 10.1039/c3nr00760j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
For the first time, we report the possibility of utilizing Li2CoPO4F as a novel cathode material for hybrid capacitor applications. Li2CoPO4F powders were prepared by a conventional two-step solid state method. A hybrid cell was fabricated using Li2CoPO4F as the cathode along with activated carbon (AC) as the anode in 1 M LiPF6 dissolved in 1 : 1 EC/DMC electrolyte and its electrochemical properties were examined by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and constant current charge-discharge (C-D) techniques. The Li2CoPO4F/AC cell is capable of delivering a discharge capacitance of 42 F g(-1) at 150 mA g(-1) current density within 0-3 V region having excellent coulombic efficiency of over 99% even after 1000 cycles. Furthermore, the Li2CoPO4F/AC cell exhibited excellent rate performance with an energy density of ~24 W h kg(-1) at 1100 mA g(-1) current and maintained about 92% of its initial value even after 30,000 C-D cycles. Electrochemical impedance spectroscopy was conducted to corroborate the results that were obtained and described.
Collapse
Affiliation(s)
- K Karthikeyan
- Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea.
| | | | | | | | | | | | | |
Collapse
|
26
|
Cheung KW, Chung SL, Chung KY, Chiu KH. Patient perception and knowledge on total joint replacement surgery. Hong Kong Med J 2013; 19:33-37. [PMID: 23378352] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023] Open
Abstract
OBJECTIVES To study patients' perceptions and knowledge about total joint replacement surgery. DESIGN; Cross-sectional survey. SETTING; University teaching hospital, Hong Kong. PATIENTS Three hundred consecutive patients with the diagnosis of osteoarthritis or inflammatory arthritis attending the out-patient clinic from June 2010 to May 2011. MAIN OUTCOME MEASURES Patients' knowledge and how they got the knowledge about total joint replacement surgery, and concerns about the outcome of such operations. RESULTS Whilst 94% of the patients knew about total joint replacement surgery, 77% obtained such knowledge from their friends and relatives. The three most common concerns related to this type of operation were whether they might: be wheelchair bound after surgery (64%), need to be taken care of by others for more than 3 months (61%), and have post-surgery complications (54%). Most of them recognised the advantages of the surgery, 82% knew about good pain relief after surgery, and 87% realised that total joint replacement surgery could improve their mobility. Patients did not have a realistic idea regarding the survival of the prosthesis; 41% thought the prosthesis might last for less than 10 years and 34% had no idea about its longevity. CONCLUSION; Patients did recognise the advantages of total joint replacement surgery in treating arthritis. However, they had many concerns about its outcome that warrant clarification. Public education on these aspects is necessary to address concerns, and may be achieved in cooperation with the media.
Collapse
Affiliation(s)
- K W Cheung
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong.
| | | | | | | |
Collapse
|
27
|
Chung KY, Baxa TJ, Parr SL, Luqué LD, Johnson BJ. Administration of estradiol, trenbolone acetate, and trenbolone acetate/estradiol implants alters adipogenic and myogenic gene expression in bovine skeletal muscle. J Anim Sci 2012; 90:1421-7. [PMID: 22573834 DOI: 10.2527/jas.2011-3496] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Twenty crossbred yearling steers (421 kg) were used to evaluate the effects of implanting with trenbolone acetate (TBA; 120 mg), estradiol-17β (E(2); 25.7 mg), and a combination (120 mg of TBA and 24 mg of E(2)) on adipogenic and myogenic mRNA concentrations. Animals were blocked by BW and within each block were assigned to 1 of 4 treatments. Animals were housed and fed in individual pens with 5 animals per treatment. All animals were weighed weekly, and muscle biopsy samples were taken from the LM of each steer on d 0 (before implantation), 7, 14, and 28. Total RNA was isolated from each sample and real-time quantitative PCR was used to measure the quantity of C/EBPβ, PPARγ, stearoyl CoA desaturase (SCD), myogenin, and 3 isoforms of bovine myosin heavy chain (MHC) mRNA. Total BW gain from the 28-d period was adjusted to d 0 by use of covariant analysis, and steers in the implant groups tended (P = 0.09) to have increased BW gain compared with nonimplanted control steers. Analysis of the gene expression of MHC showed that neither implant nor day (P > 0.20) had a significant effect on the expression of type I or IIX MHC mRNA There was also no treatment effect (P > 0.20) on MHC-IIA and myogenin, but increasing days on feed increased (P = 0.05) the expression of MHC-IIA mRNA. Relative mRNA abundance of C/EBPβ, PPARγ, and SCD increased (P < 0.05) during days of feed but PPARγ decreased (P < 0.05) with the treatment of combined TBA/E(2) implant. Results of this study indicate that implanting with TBA, E(2), or both increased BW gain and decreased adipogenic gene expression of finishing steers without significantly affecting the concentration of type I, IIA, or IIX MHC mRNA. Increasing days on feed increased both MHC-IIA and adipogenic gene expression in bovine skeletal muscle biopsy samples. We conclude that administration of steroidal implants had no effect on the proportion of the 3 MHC mRNA isoforms but decreased C/EBPβ, PPARγ, and SCD mRNA in bovine skeletal muscle.
Collapse
Affiliation(s)
- K Y Chung
- Department of Animal and Food Science, Texas Tech University, Lubbock 79409, USA
| | | | | | | | | |
Collapse
|
28
|
|
29
|
Smith SB, Go GW, Johnson BJ, Chung KY, Choi SH, Sawyer JE, Silvey DT, Gilmore LA, Ghahramany G, Kim KH. Adipogenic gene expression and fatty acid composition in subcutaneous adipose tissue depots of Angus steers between 9 and 16 months of age. J Anim Sci 2012; 90:2505-14. [PMID: 22307484 DOI: 10.2527/jas.2011-4602] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We have demonstrated that among carcass adipose tissue depots, brisket subcutaneous adipose tissue contains the greatest concentration of MUFA and lowest concentration of SFA. Therefore, we hypothesized that brisket subcutaneous adipose tissue depots would exhibit greater adipogenic gene expression over time than other major subcutaneous adipose tissue depots. Four Angus steers, each at 9, 12, 14, and 16 mo of age, were harvested and fresh subcutaneous adipose tissue samples were collected from over the brisket, chuck, rib, loin, sirloin, round, flank, and plate. Relative gene expression for C/EBPβ, PPARγ, carnitine palmitoyltransferase-1 beta (CPT-1β), stearoyl-coenzyme A desaturase (SCD), AMP-activated protein kinase alpha (AMPKα), and G-coupled protein receptor 43 (GPR43) was analyzed by quantitative real-time PCR. Expression of C/EBPβ, PPARγ, and CPT-1β was greatest at 12 to 14 mo of age (all P < 0.0001) and declined to very low abundance by 16 mo of age in all depots. Expression of PPARγ and CPT-1β was greater (P < 0.03) in flank, rib, and sirloin subcutaneous adipose tissues than in brisket and round adipose tissues. The expression of the SCD gene did not differ among the 4 age groups (P = 0.95). The palmitoleic:stearic acid ratio (an estimate of SCD activity) was greater (P < 0.001) in the subcutaneous adipose tissues from brisket, plate, and round than in the loin, rib, and sirloin. Conversely, subcutaneous adipose tissue from the loin, rib, and sirloin had greater (P < 0.001) SCD gene expression than the brisket, plate, and round. In general, subcutaneous adipose tissues with the highest concentration of MUFA and least SFA consistently exhibited the least SCD gene expression and adipogenic gene expression. We conclude that MUFA in the brisket and other depots with large SCD indices were deposited before 9 mo of age, during a time when the subcutaneous adipocytes were highly differentiated.
Collapse
Affiliation(s)
- S B Smith
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Miller EK, Chung KY, Hutcheson JP, Yates DA, Smith SB, Johnson BJ. Zilpaterol hydrochloride alters abundance of β-adrenergic receptors in bovine muscle cells but has little effect on de novo fatty acid biosynthesis in bovine subcutaneous adipose tissue explants. J Anim Sci 2011; 90:1317-27. [PMID: 22079997 DOI: 10.2527/jas.2011-4589] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
We predicted that zilpaterol hydrochloride (ZH), a β-adrenergic receptor (AR) agonist, would depress mRNA and protein abundance of β-AR in bovine satellite cells. We also predicted that ZH would decrease total lipid synthesis in bovine adipose tissue. Bovine satellite cells isolated from the semimembranosus muscle were plated on tissue culture plates coated with reduced growth factor matrigel or collagen. Real-time quantitative PCR was used to measure specific gene expression after 48 h of ZH exposure in proliferating satellite cells and fused myoblasts. There was no effect of ZH dose on [(3)H]thymidine incorporation into DNA in proliferating myoblasts. Zilpaterol hydrochloride at 1 µM decreased (P < 0.05) β1-AR mRNA, and 0.01 and 1 µM ZH decreased (P < 0.05) β2-AR and β3-AR mRNA in myoblasts. The expression of IGF-I mRNA tended to increase (P = 0.07) with 1 µM ZH. There was no effect (P > 0.10) of ZH on the β-AR or IGF-I gene expression in fused myotube cultures at 192 h or on fusion percentage. The β2-AR antagonist ICI-118, 551 at 0.1 µM attenuated (P < 0.05) the effect of 0.1 µM ZH to reduce expression of β1- and β2-AR mRNA. The combination of 0.01 µM ZH and 0.1 µM ICI-118, 551 caused an increase (P < 0.05) in β1-AR gene expression. There was no effect (P > 0.10) of ICI-118, 551 or ZH on β3-AR or IGF-I. Western blot analysis revealed that the protein content of β2-AR in ZH-treated myotube cultures decreased (P < 0.05) relative to control. Total lipid synthesis from acetate was increased by ZH in bovine subcutaneous adipose tissue explants in the absence of theophylline but was decreased by ZH when theophylline was included in the incubation medium. These data indicate that ZH alters mRNA and protein concentrations of β-AR in satellite cell cultures, which in turn could affect responsiveness of cells to prolonged ZH exposure in vivo. Similar to other β-adrenergic agonists, ZH had only modest effects on lipid metabolism in adipose tissue explants.
Collapse
Affiliation(s)
- E K Miller
- Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506, USA
| | | | | | | | | | | |
Collapse
|
31
|
Haam SJ, Lee JG, Kim DJ, Chung KY, Park IK. Oesophagography and oesophagoscopy are not necessary in patients with spontaneous pneumomediastinum. Emerg Med J 2011; 27:29-31. [PMID: 20029003 DOI: 10.1136/emj.2008.065565] [Citation(s) in RCA: 6] [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: 11/03/2022]
Abstract
BACKGROUND Because the condition is rare, the proper assessment of spontaneous pneumomediastinum (SPM) remains controversial. The purpose of this study was to determine whether additional oesophageal investigations beyond chest x ray and chest computed tomography (CT) scan are necessary for the diagnosis of SPM. METHODS The medical records of 25 patients diagnosed and treated for SPM from March 1986 to December 2007 were retrospectively reviewed. RESULTS There were 22 men and 3 women, with a median age of 19 years (range 15-57 years). All patients received chest x rays, which revealed air shadows within the mediastinum or subcutaneous emphysema in 24 patients. Twenty-two patients underwent chest CT scans, which showed pneumomediastinum in all cases. Oesophagography was performed in 14 patients and oesophagoscopy in three. All oesophagographies and oesophagoscopies were clear. Despite conservative treatment, no patients developed mediastinitis or complications associated with oesophageal injury. CONCLUSIONS Chest x ray and CT scan are sufficient to diagnose SPM. Additional diagnostic assessments such as oesophagography and oesophagoscopy are not necessary in patients without evidence of mediastinitis or a history of oesophageal injury.
Collapse
Affiliation(s)
- S J Haam
- 134 Sinchon-dong, Seodaemun-gu, CPO Box 8044, Seoul 120-752, South Korea;
| | | | | | | | | |
Collapse
|
32
|
Abstract
BACKGROUND Infraorbital dark circles are a cosmetic concern for a large number of individuals. However, the exact definition and precise cause has not been elucidated clearly. In our experience infraorbital dark circles due to thin and translucent lower eyelid skin overlying the orbicularis oculi muscle can be treated successfully with autologous fat transplantation. OBJECTIVES This study was conducted to clarify the nature of dark circles under the eyes and determine the efficacy of autologous fat transplantation. PATIENTS AND METHODS Ten patients with dark circles due to increased vascularity and translucency of the skin were included. They received at least one autologous fat transplantation and follow-up evaluations were conducted at least 3 months after the last treatment. RESULTS An average of 1.6 autologous fat transplantations were done in both infraorbital areas. Patients showed an average of 78% improvement (average grading scale: 2.6 out of 4). Most of the patients showed improvement in the infraorbital darkening and contour of the lower eyelids. CONCLUSIONS Autologous fat transplantation is an effective method for the treatment of infraorbital dark circles due to thin and translucent lower eyelid skin overlying the orbicularis oculi muscle.
Collapse
Affiliation(s)
- M R Roh
- Department of Dermatology, Yonsei University College of Medicine, Seoul, Korea
| | | | | |
Collapse
|
33
|
Abstract
OBJECTIVES alpha-Melanocyte stimulating hormone (alpha-MSH) may ameliorate renal ischemia-reperfusion (I/R) injury. Recent data suggest that melanocortin receptors may be related to the anti-inflammatory and immunomodulating action for alpha-MSH. We designed this experiment to determine the renal distribution of alpha-MSH receptors; melanocortin-1 receptor (MC-1R) and melanocortin-3 receptor (MC-3R). METHODS Sprague-Dawley male rats (n = 24) were randomly divided into 2 groups: the sham (n = 2) and the operation groups with warm ischemia (n = 12). Animals in the operation group were subjected to 40 minutes of warm renal ischemia. Western blotting analyses and immunohistochemistry were employed to determine expression of MC-1R and MC-3R. RESULTS Expression of MC-1R and MC-3R was decreased on 1 day after reperfusion. Immunohistochemical study confirmed the findings of Western blot analysis. CONCLUSIONS The present study demonstrated novel renal expression of MC-1R and MC-3R, especially in the outer medulla, representative of the renal I/R injury. Our current study suggested that the mechanisms of action of alpha-MSH may significantly attenuate the renal I/R injury by specific kidney-targeted effects via MC-Receptors as well as by systemic cytokine effects.
Collapse
Affiliation(s)
- Y S Lee
- Division of Nephrology, the Eulji University Hospital, Seoul, South Korea.
| | | | | |
Collapse
|
34
|
Kamanga-Sollo E, White ME, Chung KY, Johnson BJ, Dayton WR. Potential role of G-protein-coupled receptor 30 (GPR30) in estradiol-17beta-stimulated IGF-I mRNA expression in bovine satellite cell cultures. Domest Anim Endocrinol 2008; 35:254-62. [PMID: 18650055 DOI: 10.1016/j.domaniend.2008.06.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Revised: 05/14/2008] [Accepted: 06/02/2008] [Indexed: 10/21/2022]
Abstract
Androgenic and estrogenic steroids enhance muscle growth in animals and humans. Estradiol-17beta (E2) and trenbolone acetate (TBA) (a synthetic testosterone analog) increased IGF-I mRNA expression in bovine muscle satellite cell (BSC) cultures. The goal of this study was to evaluate the mechanisms responsible for this increase by evaluating the effects of ICI 182 780 (an E2 receptor antagonist), flutamide (an androgen receptor inhibitor), G1 (a GPR30 agonist), and BSA-conjugated E2 on E2 and/or TBA-stimulated IGF-I mRNA expression in BSC cultures. Flutamide completely suppressed TBA-stimulated IGF-I mRNA expression in BSC cultures. ICI 182 780 did not suppress E2-stimulated IGF-I mRNA expression and 100 nM ICI 182 780 enhanced (93%, p<0.05) IGF-I mRNA levels in BSC cultures. G1 (100 nM) stimulated IGF-I mRNA expression (100%, p<0.05) but had no effect on proliferation in BSC cultures. E2-BSA, which cannot cross the cell membrane, stimulated IGF-I mRNA expression (approximately 100%, p<0.05) in BSC but even at extremely high concentrations had no effect on proliferation. In summary, our data indicate the E2-stimulation of proliferation and E2-stimulation of IGF-I mRNA expression in BSC cultures occur via different mechanisms. Our previous results showing that ICI 182 780 inhibited BSC proliferation and results of the current study showing lack of response to E2-BSA or G1 suggest that E2-stimulated proliferation in BSC cultures is mediated through classical estrogen receptors. Stimulation by ICI 182 780, G1 and E2-BSA suggests the E2-stimulated IGF-I mRNA expression in BSC cultures is mediated through the GPR30 receptor.
Collapse
MESH Headings
- Androgen Antagonists/pharmacology
- Animals
- Cattle/physiology
- Cell Proliferation/drug effects
- Cyclin G
- Cyclin G1
- Cyclins/pharmacology
- Estradiol/analogs & derivatives
- Estradiol/pharmacology
- Estrogen Antagonists/pharmacology
- Flutamide/pharmacology
- Fulvestrant
- Insulin-Like Growth Factor I/biosynthesis
- Insulin-Like Growth Factor I/genetics
- Male
- Muscle, Skeletal/cytology
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/metabolism
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- Receptors, G-Protein-Coupled/metabolism
- Reverse Transcriptase Polymerase Chain Reaction/veterinary
- Satellite Cells, Skeletal Muscle/cytology
- Satellite Cells, Skeletal Muscle/drug effects
- Satellite Cells, Skeletal Muscle/metabolism
- Serum Albumin, Bovine/pharmacology
- Trenbolone Acetate/analogs & derivatives
- Trenbolone Acetate/pharmacology
Collapse
Affiliation(s)
- E Kamanga-Sollo
- Animal Growth and Development Laboratory, Department of Animal Science, University of Minnesota, 348 ABLMS, Eckles Avenue, St. Paul, MN 55108, USA
| | | | | | | | | |
Collapse
|
35
|
Affiliation(s)
- K-Y Lee
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, South Korea
| | | | | | | |
Collapse
|
36
|
Kamanga-Sollo E, White ME, Hathaway MR, Chung KY, Johnson BJ, Dayton WR. Roles of IGF-I and the estrogen, androgen and IGF-I receptors in estradiol-17beta- and trenbolone acetate-stimulated proliferation of cultured bovine satellite cells. Domest Anim Endocrinol 2008; 35:88-97. [PMID: 18403176 DOI: 10.1016/j.domaniend.2008.02.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2008] [Revised: 02/18/2008] [Accepted: 02/24/2008] [Indexed: 02/02/2023]
Abstract
Although numerous studies have shown that both androgenic and estrogenic steroids increase rate and efficiency of muscle growth in steers, there is little consensus as to their mechanism of action. A combined estradiol 17beta (E2)/trenbolone acetate (TBA) implant causes a significant increase in muscle IGF-I mRNA and both E2 and TBA stimulate a significant increase in IGF-I mRNA level in bovine satellite cell (BSC) cultures in media containing 10% fetal bovine serum (FBS). Consequently, increased IGF-I expression may play a role in anabolic-steroid-enhanced muscle growth. However, even though treatment of cultured BSC with E2 or TBA in media containing 1% IGFBP-3-free swine serum (SS) results in increased proliferation there is no effect on IGF-I mRNA expression, suggesting that increased IGF-I expression may not be responsible for anabolic-steroid-enhanced BSC proliferation. To further examine the role of estrogen, androgen and IGF-I receptors and their respective ligands in E2- and TBA-stimulated BSC proliferation, we assessed the effects of specific inhibitors on E2- or TBA-stimulated proliferation of BSC. Both ICI 182 780 (an estrogen receptor blocker) and flutamide (an inhibitor of androgen receptor) suppressed (p<0.05) E2- and TBA-stimulated BSC proliferation, respectively. JB1 (a competitive inhibitor of IGF-I binding to type I IGF receptor) reduced (p<0.05) both E2- and TBA-stimulated proliferation in BSC cultures. Both the Raf-1/MAPK kinase (MEK)1/2/ERK1/2, and the phosphatidylinositol 3-kinase (PI3K)/Akt pathways play significant roles in the actions of IGF-I on proliferation and differentiation of myogenic cells. PD98059, an inhibitor of the MAPK pathway, and wortmannin, an inhibitor of the PI3K pathway, both suppressed (p<0.05) E2- and TBA-stimulated proliferation of cultured BSC. Our data suggest that IGF-I plays a role in E2- and TBA-stimulated proliferation of cultured BSC even in the absence of increased IGF-I expression.
Collapse
MESH Headings
- Anabolic Agents/pharmacology
- Androstadienes/pharmacology
- Animals
- Cattle
- Cell Proliferation/drug effects
- Cells, Cultured
- Culture Media/chemistry
- Culture Media/pharmacology
- Estradiol/analogs & derivatives
- Estradiol/pharmacology
- Estrogen Antagonists/pharmacology
- Flavonoids/pharmacology
- Fulvestrant
- Gene Expression/drug effects
- Insulin-Like Growth Factor I/genetics
- Insulin-Like Growth Factor I/metabolism
- Insulin-Like Growth Factor I/physiology
- Mitogen-Activated Protein Kinase Kinases/antagonists & inhibitors
- RNA, Messenger/metabolism
- Receptor, IGF Type 1/genetics
- Receptor, IGF Type 1/metabolism
- Receptor, IGF Type 1/physiology
- Receptors, Androgen/genetics
- Receptors, Androgen/metabolism
- Receptors, Androgen/physiology
- Receptors, Estrogen/genetics
- Receptors, Estrogen/metabolism
- Receptors, Estrogen/physiology
- Satellite Cells, Skeletal Muscle/drug effects
- Satellite Cells, Skeletal Muscle/metabolism
- Satellite Cells, Skeletal Muscle/physiology
- Trenbolone Acetate/analogs & derivatives
- Trenbolone Acetate/pharmacology
- Wortmannin
Collapse
Affiliation(s)
- E Kamanga-Sollo
- Animal Growth and Development Laboratory, Department of Animal Science, University of Minnesota, 348 Andrew Boss Laboratory, 1354 Eckles Avenue, St. Paul, MN 55108, USA
| | | | | | | | | | | |
Collapse
|
37
|
Jung JY, Goo B, Choi YJ, Chung HJ, Chung KY. A case of granuloma pyogenicum presenting as an intravascular mass: evaluation by ultrasonography. J Eur Acad Dermatol Venereol 2008; 22:515-7. [DOI: 10.1111/j.1468-3083.2007.02377.x] [Citation(s) in RCA: 5] [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: 10/23/2022]
|
38
|
Jung JY, Roh MR, Chung HJ, Chung KY. Desmoplastic malignant melanoma evaluated with 18F-fluorodeoxyglucose positron emission tomography-computed tomography and sentinel lymph node biopsy. J Eur Acad Dermatol Venereol 2008; 22:126-7. [PMID: 18181996 DOI: 10.1111/j.1468-3083.2007.02290.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
39
|
Abstract
BACKGROUND Intramuscular human immunoglobulin (HIG) may provide a therapeutic option as an independent or combined treatment for recalcitrant suppurative skin diseases such as hidradenitis suppurativa, folliculitis decalvans, or chronic recurrent furunculosis or folliculitis. OBJECTIVES To define the efficacy and safety of intramuscular HIG for chronic and recalcitrant suppurative skin diseases. METHODS Patients who had received HIG for hidradenitis suppurativa, folliculitis decalvans, furunculosis or folliculitis at Severance Hospital, Seoul, Korea, between January 2000 and May 2005 were identified from medical/pharmacy records. All records were analysed retrospectively. RESULTS Sixty-three patients were identified. After treatment, 37 patients (59%) showed overall improvement and were rated as having an 'excellent response' or 'good response' by the attending physician. No improvement or worsening was seen in only three patients (5%). A period without new lesions (PWNL) was achieved in 46 patients (73%). The number of times HIG was administered to achieve PWNL ranged from 1 to 12 (mean +/- SD 2.15 +/- 1.69). There was no significant difference in the rating score between the independent intramuscular HIG and the combined treatment groups. Pain at the injection site was the major side-effect, which led to the discontinuation of treatment in five patients. No other significant systemic side-effects were observed. CONCLUSIONS Our results demonstrate that intramuscular HIG may be used for the treatment of recalcitrant suppurative skin diseases as an independent or combined treatment.
Collapse
Affiliation(s)
- B Goo
- Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, 134 Shinchon-Dong, Seodaemoon-Gu, Seoul 120-752, Korea
| | | | | | | |
Collapse
|
40
|
Abstract
Nucleoporin 98 (NUP98) is a component of the nuclear pore complex that facilitates mRNA export from the nucleus. It is mapped to 11p15.5 and is fused to a number of distinct partners, including nine members of the homeobox family as a consequence of leukemia-associated chromosomal translocations. NUP98-HOXA9 is associated with the t(7;11)(p15;p15) translocation in acute myeloid leukemia (AML), myelodysplastic syndrome, and blastic crisis of chronic myeloid leukemia. Expression of NUP98-HOXA9 in murine bone marrow resulted in a myeloproliferative disease progressing to AML by 7-8 months. Transduction of NUP98 fusion genes into human CD34(+) cells confers a proliferative advantage in long-term cytokine-stimulated and stromal cocultures and in NOD-SCID engrafted mice, associated with a five- to eight-fold increase in hematopoietic stem cells. NUP98-HOXA9 expression inhibited erythroid and myeloid differentiation but enhanced serial progenitor replating. NUP98-HOXA9 upregulated a number of homeobox genes of the A and B cluster as well as MEIS1 and Pim-1, and downmodulated globin genes and C/EBPalpha. The HOXA9 component of the NUP98-HOXA9 fusion protein was protected from cullin-4A-mediated ubiquitination and subsequent proteasome-dependent degradation. In NUP98-HOX-transduced CD34(+) cells and cells from AML patients with t(7;11)(p15;p15) NUP98 was no longer associated with the nuclear pore complex but formed intranuclear aggregation bodies. Analysis of NUP98 allelic expression in AML and myelodysplastic syndrome showed loss of heterozygosity observed in 29% of the former and 8% of the latter. This was associated with poor prognosis.
Collapse
MESH Headings
- Alleles
- Animals
- Antigens, CD34/biosynthesis
- Cell Nucleus/metabolism
- Chromosomes, Human, Pair 11
- Chromosomes, Human, Pair 7
- Gene Expression Regulation, Neoplastic
- Humans
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/metabolism
- Loss of Heterozygosity
- Mice
- Mice, Inbred NOD
- Mice, SCID
- Myelodysplastic Syndromes/genetics
- Myelodysplastic Syndromes/metabolism
- Nuclear Pore Complex Proteins/physiology
Collapse
Affiliation(s)
- M A S Moore
- Moore Laboratory, Cell Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
| | | | | | | | | | | | | |
Collapse
|
41
|
Chung KY, Lunt DK, Kawachi H, Yano H, Smith SB. Lipogenesis and stearoyl-CoA desaturase gene expression and enzyme activity in adipose tissue of short- and long-fed Angus and Wagyu steers fed corn- or hay-based diets. J Anim Sci 2007; 85:380-7. [PMID: 17235023 DOI: 10.2527/jas.2006-087] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [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: 11/13/2022] Open
Abstract
Angus and Wagyu steers consuming high-roughage diets exhibit large differences in adipose tissue fatty acid composition, but there are no differences in terminal measures of stearoyl-CoA desaturase (SCD) activity or gene expression. Also, adipose tissue lipids of cattle fed corn-based diets have greater MUFA:SFA ratios than cattle fed hay-based diets. We hypothesized that any changes in SCD gene expression and activity would precede similar changes in adipose tissue lipogenesis between short- and long-fed endpoints. Furthermore, changes in SCD activity and gene expression between production endpoints would differ between corn- and hay-fed steers and between Wagyu and Angus steers. Angus (n = 8) and Wagyu (n = 8) steers were fed a corn-based diet for 8 mo (short-fed; 16 mo of age) or 16 mo (long-fed; 24 mo of age), whereas another group of Angus (n = 8) and Wagyu (n = 8) steers was fed a hay-based diet for 12 mo (short-fed; 20 mo of age) or 20 mo (long-fed; 28 mo of age) to match the end point BW of the corn-fed steers. Acetate incorporation into lipids in vitro was greater (P < 0.01) in corn-fed steers than in hay-fed steers and tended (P = 0.06) to be greater in Wagyu than in Angus s.c. adipose tissue because the rate in Wagyu was twice that of Angus adipose tissue in the corn-fed, short-fed steers. There were diet x end point interactions for lipogenesis in i.m. and s.c. adipose tissues (both P < 0.01) because lipogenesis was 60 to 90% lower in the long-fed cattle than in short-fed cattle fed the corn-based diet. The greatest SCD enzyme activity in Angus s.c. adipose tissue was observed at 24 mo of age (corn-based diet), but activity in Wagyu adipose tissue was greatest at 28 mo of age (hay-based diet; breed x diet x end point interaction, P = 0.08). For short- vs. long-fed endpoints in Angus, s.c. adipose tissue SCD activity was less (hay diet) or the same (corn diet). Conversely, SCD gene expression was greatest in long-fed Wagyu steers fed the hay- or corn-based diets (breed x end point interaction; P < 0.01). Contrary to our hypotheses, SCD activity increased over time, whereas lipogenesis from acetate decreased. However, the developmental pattern of SCD gene expression and activity differed markedly between hay-fed Angus and Wagyu adipose tissues, which may explain the differences in the MUFA:SFA ratios observed in adipose tissues from these cattle.
Collapse
Affiliation(s)
- K Y Chung
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA
| | | | | | | | | |
Collapse
|
42
|
Rhoades RD, Sawyer JE, Chung KY, Schell ML, Lunt DK, Smith SB. Effect of dietary energy source on in vitro substrate utilization and insulin sensitivity of muscle and adipose tissues of Angus and Wagyu steers. J Anim Sci 2007; 85:1719-26. [PMID: 17339414 DOI: 10.2527/jas.2006-498] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [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: 11/13/2022] Open
Abstract
Angus (n = 8; 210 kg of BW) and 7/8 Wagyu (n = 8; 174 kg of BW) steers were used to evaluate the effects of dietary energy source on muscle and adipose tissue metabolism and insulin sensitivity. Steers were assigned to either a grain-based (corn) or hay-based (hay) diet and fed to similar final BW. At slaughter, LM and s.c. and i.m. adipose tissue samples were collected. Portions of the LM and adipose tissues were placed immediately in liquid N for later measurement of glycolytic intermediates. Fresh LM and s.c. and i.m. adipose tissues were incubated with [U-(14)C]glucose to assess glucose metabolism in vitro. All in vitro measures were in the presence of 0 or 500 ng/mL of insulin. Also, s.c. and i.m. adipose tissues were incubated with [1-(14)C]acetate to quantify lipid synthesis in vitro. Glucose-6-phosphate and fructose-6-phosphate concentrations were 12.6- and 2.4-fold greater in muscle than in s.c. and i.m. adipose tissues, respectively. Diet did not affect acetate incorporation into fatty acids (P = 0.86). Insulin did not increase conversion of glucose to CO(2), lactate, or total lipid in steers fed hay but caused an increase (per cell) of 97 to 110% in glucose conversion to CO(2), 46 to 54% in glucose conversion to lactate, and 65 to 160% in glucose conversion to total lipid content in adipose tissue from steers fed corn. On a per-cell basis, s.c. adipose tissue had 37% greater glucose oxidation than i.m. adipose (P = 0.04) and 290% greater acetate incorporation into fatty acids than i.m. adipose (P = 0.04). Insulin addition to s.c. adipose tissue from corn-fed steers failed to stimulate glucose incorporation into fatty acids, but exposing i.m. adipose tissue from corn-fed steers to insulin resulted in a 165% increase in glucose incorporation into fatty acids. These results suggest that feeding hay limited both glucose supply and tissue capacity to increase glucose utilization in response to insulin without altering acetate conversion to fatty acids. Because s.c. adipose tissue consistently utilized more acetate and oxidized more glucose than did i.m. adipose, these results suggest that hay-based diets may alter i.m. adipose tissue metabolism with less effect on s.c. adipose tissue.
Collapse
Affiliation(s)
- R D Rhoades
- Department of Animal Science, Texas Agricultural Experiment Station, Texas A&M University, College Station, TX 77843, USA
| | | | | | | | | | | |
Collapse
|
43
|
Abstract
Mononuclear cells play a cardinal role in the pathogenesis of systemic lupus erythematosus (SLE). A high urine cytology score has been reported to be associated with lupus nephritis in relapse. The objective of this study was to examine the urinary mononuclear cell population of patients with lupus nephritis, and explore its correlation with lupus disease activity. We studied 12 patients with active lupus nephritis, 17 patients with lupus nephritis in remission, 12 SLE patients with no history of renal disease and 13 healthy subjects. Clinical disease activity was quantified by the SLE Disease Activity Index (SLEDAI). Mononuclear cell species in the urinary sediment were examined by immunocytochemistry. Patients with active lupus nephritis had significantly more mononuclear cells in the urinary sediment. The number of CD3+ cell was significantly elevated in the active lupus nephritis than the others (P < 0.001), while there was no significant difference in the number of CD20+ and CD56+ cell among patient groups. The total urinary mononuclear cell correlated significantly with the overall SLEDAI score (r = 0.58, P < 0.001) as well as the renal score (r = 0.57, P < 0.001). The number of urinary CD3+, but not CD20+ or CD56+, cell significantly correlated with the overall SLEDAI score (r = 0.46, P = 0.003) as well as the renal score (r = 0.40, p = 0.011). In nine patients with renal biopsy, the histological activity index correlated with the total urinary mononuclear cell (r = 0.75, P = 0.02), CD3+ (r = 0.69, P = 0.04) and CD20+ cell (r = 0.69, P = 0.04). We conclude that urinary mononuclear cell was markedly elevated in patients with active lupus, and the urinary mononuclear cell count correlated significantly with the SLEDAI score and histological activity. CD3+ and CD20+ cells are the major component of urinary mononuclear cell in SLE patients and their number correlates with lupus disease activity.
Collapse
Affiliation(s)
- R W Y Chan
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | | | | | | | | | | | | | | |
Collapse
|
44
|
Szeto CC, Chow KM, Kwan BCH, Leung CB, Chung KY, Law MC, Li PKT. Relation between number of prescribed medication and outcome in peritoneal dialysis patients. Clin Nephrol 2006; 66:256-62. [PMID: 17063992 DOI: 10.5414/cnp66256] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 11/18/2022] Open
Abstract
BACKGROUND Many patients with end-stage renal disease need to take a large number of medications. In the present study, we studied the magnitude of problem and explored the relationship between the number of prescribed medications and the clinical outcome of a large cohort of prevalent peritoneal dialysis (PD) patients. METHODS We studied the medication list of 266 prevalent PD patients. Dialysis adequacy, residual renal function and nutritional assessment were also performed. The patients were followed for 33.7 +/- 20.7 months. RESULTS On average, each patient required 4.7 +/- 1.8 type of medications or 10.0 +/- 4.9 tablets per day. 40 patients (15.0%) needed at least 7 types of medication; 33 patients (12.4%) had to take more than 15 tablets each day. There is a significant but weak correlation between the number of types of medication and the Charlson's comorbidity score (r = 0.252, p < 0.001). Despite the large number of medication prescribed, the blood pressure control, serum cholesterol level, and the use of aspirin after atherosclerotic disease remained suboptimal in many patients. By multivariate analysis, independent factors for patient survival were Charlson's comorbidity score, number of types of medication, duration of dialysis, overall SGA score, and mean arterial blood pressure. Each additional type of medication conferred 20% increase in risk of death (95% CI, 1.6-41.7%, p = 0.032), and the effect is independent on the Charlson's comorbidity score. The actual number of pills taken by a patient did not influence survival in this model. CONCLUSION Our results indicate that the number of prescribed medications is related to the clinical outcome of PD patients. The number of prescribed medication may reflect the severity of uremic complications and comorbid diseases not reflected by the Charlson's comorbidity score. Nevertheless, dialysis physicians should carefully balance the clinical need of treating multiple medical conditions with the potential problems of a complicated therapeutic regimen.
Collapse
Affiliation(s)
- C C Szeto
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
| | | | | | | | | | | | | |
Collapse
|
45
|
Chung KY, Szeto CC, Chow KM, Law MC, Leung CB, Li PKT. Prevalence of Psychological Problems in Chinese Peritoneal Dialysis Patients. Int J Organ Transplant Med 2005. [DOI: 10.1016/s1561-5413(09)60189-7] [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
|
46
|
Szeto CC, Chow KM, Szeto CY, Kwan BC, Chung KY, Leung CB, Li PKT. The Relationship Between β1-adrenergic Receptor Polymorphisms and Cardiovascular Disease in Peritoneal Dialysis Patients. Int J Organ Transplant Med 2005. [DOI: 10.1016/s1561-5413(09)60185-x] [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] Open
|
47
|
Cho SB, Roh MR, Yun M, Yun SK, Lee MG, Chung KY. (18)F-fluorodeoxyglucose positron emission tomography detection of eccrine porocarcinoma. Br J Dermatol 2005; 152:372-3. [PMID: 15727659 DOI: 10.1111/j.1365-2133.2005.06314.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
48
|
Chung KY, Jeong GY, Choi KB, Sung SH, Kim YS. Prevention of primary nonfunction after canine liver allotransplantation: the effect of gadolinium chloride. Transplant Proc 2005; 36:1928-30. [PMID: 15518701 DOI: 10.1016/j.transproceed.2004.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE Effective suppression of Kupffer cell function is believed to contribute to the prevention of preservation/reperfusion injury. In this study, effect of gadolinium, a synthetic Kupffer cell suppressant, on the reperfusion injury was examined using a canine partial liver transplantation model. METHODS About a 70% partial liver segment was harvested and reimplanted in a mongrel recipient dog weighing 20 to 25 kg. Gadolinium chloride (10 mg/kg) was infused via the cephalic vein 24 hours before harvest of the partial liver (gadolinium group, n = 5). Serum aspartate aminotransferase (AST), alkaline phosphatase (ALP), lactate dehydrogenase (LDH), and morphologic grading of graft were compared with those of a control group (n = 5). Statistical analysis was done with an independent t-test. RESULTS Average total ischemic time was 4 hours and 27 minutes. At 1 hour after reperfusion, there were no significant differences in AST, ALP, or LDH levels, or pathologic scores. At 48 hours after reperfusion, AST (P = .03) and LDH (P = .05) levels were significantly lower in the gadolinium group. CONCLUSION Kupffer cell blockade using gadolinium chloride may be effective to reduce ischemia reperfusion injury, but the effect is not evident at an early stage of reperfusion.
Collapse
Affiliation(s)
- K Y Chung
- Ewha Womans University College of Medicine, Seoul, Korea.
| | | | | | | | | |
Collapse
|
49
|
Hur HW, Park SK, Chung KY, Kang H, Lee SI. Nitrogen and phosphorus removal from swine wastewater by intermittently aerated dynamic-flow system. Water Sci Technol 2004; 49:367-372. [PMID: 15137446] [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] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This study was performed to evaluate the effects of the volume fraction of an anaerobic reactor (VFAR) and SRT on the removal of T-N and T-P in both an intermittently aerated system (IAS) and intermittently aerated dynamic-flow system (IADS), respectively. When the VFAR in the total volume of reactor from both IAS and IADS are 13%, 7%, and 0% at 5 days of SRT, the removal efficiencies of T-P were 80-87%, 62-65% and <30%, respectively. However, it was observed from this study that the removal efficiencies of T-N and T-P were not correlated to VFAR at a predetermined SRT, producing greater than 5000 mg/L of MLVSS. Also, IADS was shown to have the greater buffer capacity and adaptability to resist the shock due to the loading of high concentration of N. Furthermore, IADS achieved over 80% of removal efficiency of N even at much lower C/N ratio of 4.7. Therefore, it seems that IADS has the significant advantages over other biological nutrients removal processes.
Collapse
Affiliation(s)
- H W Hur
- Environmental Technologies Research Team, Hanwha Engineering and Construction, Taejon 305-345, Korea.
| | | | | | | | | |
Collapse
|
50
|
Smith SB, Hively TS, Cortese GM, Han JJ, Chung KY, Casteñada P, Gilbert CD, Adams VL, Mersmann HJ. Conjugated linoleic acid depresses the delta9 desaturase index and stearoyl coenzyme A desaturase enzyme activity in porcine subcutaneous adipose tissue. J Anim Sci 2002; 80:2110-5. [PMID: 12211379] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023] Open
Abstract
Conjugated linoleic acid (CLA) has been shown to have an effect on subcutaneous fatty acid composition and has been reported to decrease stearoyl coenzyme A desaturase (SCD) activity by decreasing mRNA expression and(or) catalytic activity in rodents and rodent cell lines. This investigation was designed to study the effects of CLA, corn oil, or beef tallow supplementation on s.c. adipose tissue fatty acid composition, adiposity, SCD enzyme activity, and the delta9 desaturase index in piglets. Eighteen crossbred barrows 16 to 18 d of age were adapted to diet for 1 wk and then assigned randomly to one of three treatments: 1.5% added CLA, 1.5% added corn oil, or 1.5% added beef tallow. Barrows were penned individually and fed the supplemental oils for 35 d (to 25.6 +/- 0.6 kg BW). Subcutaneous adipose tissue samples were obtained after slaughter. Fatty acid composition of the s.c. adipose tissue differed for each fatty acid measured due to diet with the exception of 18:3. The concentrations of CLA trans-10, cis-12 and cis-9, trans-11 were elevated from nondetectable to 1.62 and 2.52 g/100 g lipid, respectively (P < 0.001 for both isomers). Conjugated linoleic acid decreased the delta9 desaturase index (P < 0.01) and SCD enzyme activity, expressed as nanomoles of palmitate converted to palmitoleate/(7 min x g of tissue) (P = 0.075) and nanomoles of palmitate converted to palmitoleate/(7 min 105 cells) (P= 0.056). Tallow-fed pigs had a greater proportion of large adipocytes (> 700 pL) and the greatest SCD activity. These data provide the first direct evidence that dietary CLA depresses SCD enzyme activity in porcine adipose tissue, which may in part be responsible for the depression of adiposity by CLA observed by others in market weight pigs.
Collapse
Affiliation(s)
- S B Smith
- Department of Animal Science, Texas Agricultural Experiment Station, Texas A&M University, College Station 77843, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|