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Yan S, Bowsher J, Yoo S, Yin F. SU-D-500-06: On-Board Robotic Multi-Pinhole SPECT System for Prone Breast Imaging. Med Phys 2013. [DOI: 10.1118/1.4814023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Cerna D, Carter D, Takebe N, Coleman C, Yoo S. 624 Radiosensitization of Glioma Cell Lines by a Novel Peptidomimetic of the Second Mitochondria-derived Activator of Caspases (SMAC). Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)72421-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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128
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Bang S, Yoo S, Yang TJ, Cho H, Hwang SW. Nociceptive and pro-inflammatory effects of dimethylallyl pyrophosphate via TRPV4 activation. Br J Pharmacol 2012; 166:1433-43. [PMID: 22300296 DOI: 10.1111/j.1476-5381.2012.01884.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Sensory neuronal and epidermal transient receptor potential ion channels (TRPs) serve an important role as pain sensor molecules. While many natural and synthetic ligands for sensory TRPs have been identified, little is known about the endogenous activator for TRPV4. Recently, we reported that endogenous metabolites produced by the mevalonate pathway regulate the activities of sensory neuronal TRPs. Here, we show that dimethylallyl pyrophosphate (DMAPP), a substance produced by the same pathway is an activator of TRPV4. EXPERIMENTAL APPROACH We examined the effects of DMAPP on sensory TRPs using Ca²⁺ imaging and whole-cell electrophysiology experiments with a heterologous expression system (HEK293T cells transfected with individual TRP channels), cultured sensory neurons and keratinocytes. We then evaluated nociceptive behavioural and inflammatory changes upon DMAPP administration in mice in vivo. KEY RESULTS In the HEK cell heterologous expression system, cultured sensory neurons and keratinocytes, µM concentrations of DMAPP activated TRPV4. Agonistic and antagonistic potencies of DMAPP for other sensory TRP channels were examined and activation of TRPV3 by camphor was found to be inhibited by DMAPP. In vivo assays, intraplantar injection of DMAPP acutely elicited nociceptive flinches that were prevented by pretreatment with TRPV4 blockers, indicating that DMAPP is a novel pain-producing molecule through TRPV4 activation. Further, DMAPP induced acute inflammation and noxious mechanical hypersensitivities in a TRPV4-dependent manner. CONCLUSIONS AND IMPLICATIONS Overall, we found a novel sensory TRP acting metabolite and suggest that its use may help to elucidate the physiological role of TRPV4 in nociception and associated inflammation.
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Sekulic A, Migden M, Oro A, Lewis K, Hainsworth J, Yoo S, Dirix L, Hou J, Yue H, Hauschild A. Efficacy and Safety of the Hedgehog Pathway Inhibitor Vismodegib in Patients with Advanced Basal Cell Carcinoma (BCC): 12-Month Erivance BCC Study Update. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)33694-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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130
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Grosse-Wortmann L, Drolet C, Dragulescu A, Kotani Y, Chaturvedi R, Lee K, Mertens L, Taylor K, La Rotta G, van Arsdell G, Redington A, Yoo S. 807 Aortopulmonary Collateral Flow Volume Impacts Early Postoperative Outcome After Fontan Completion: A Multimodality Study. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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La Rotta G, Drolet C, Chaturvedi R, Taylor K, Redington A, Yoo S, Grosse-Wortmann L. 708 Measurement of Agreement Between Pulmonary Blood Flow By Direct Fick and Cardiac Magnetic Resonance in the Setting of Complex Single Ventricle Physiology With Aorto-Pulmonary Collaterals. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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132
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Schantz D, Benson L, Windram J, Wong D, Dragulescu A, Yoo S, Mertens L, Friedberg M, Al Nafisi B, Grosse-Wortmann L. 808 Mitral Valve Dimensions in Children With Hypertrophic Cardiomyopathy. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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133
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Grosse-Wortmann L, Kozak M, Mertens L, Ho A, Yoo S. 356 Assessment of Ductal Blood Flow in Newborns With Obstructive Left Heart Lesions by Magnetic Resonance. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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134
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Yoo S, Webb AS, Standish RJ, May-Smith TC, Sahu JK. Q-switched neodymium-doped Y3Al5O12-based silica fiber laser. OPTICS LETTERS 2012; 37:2181-2183. [PMID: 22739848 DOI: 10.1364/ol.37.002181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present pulsed laser operation in a Nd-doped, Y3Al5O12-based silica fiber. The fiber was fabricated using the rod-in-tube technique with a Nd:YAG crystal rod as the core material and a silica tube for the cladding material. A spectroscopy study revealed that the core region had become amorphous in the process of fiber drawing. Q-switched pulsed laser operation was realized at a wavelength of 1058 nm when the fiber was cladding pumped at a wavelength of 808 nm. The laser delivered 38 μJ of energy in 65 ns pulses. The extracted energy was limited due to the multimodal operation of the fiber. Laser slope efficiency in continuous wave operation reached 52%. The spectroscopic properties of the fabricated fiber are discussed and compared to a Nd:YAG crystal and a Nd:Al-doped silica fiber.
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Wu Q, Yoo S, Das S, Yin F. SU-E-T-559: Evaluation of Flatening Filter Free (FFF) Beams in Radiotherapy of Head and Neck Cancer. Med Phys 2012; 39:3834. [DOI: 10.1118/1.4735648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Kim D, Yoo S, Cho W, Kim M, Jung J, Lee S, Suh T. SU-E-T-296: Optimization of the Energy Selection System with Varying Magnetic Field for Laser-Accelerated Proton Beams. Med Phys 2012; 39:3771. [PMID: 28517284 DOI: 10.1118/1.4735373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Laser-based accelerated proton beams are unsuitable for clinical use because of their broad energy spectra. For this reason, it is essential to employ an energy selection system (ESS). The purpose of this study is to determine optimum parameters of the ESS which uses a varying magnetic field to generate Bragg-peak. METHODS We simulated an accelerated proton beams using radiation pressure acceleration mechanism with carbon-proton mixture target. The density ratio (n = 6) between the protons and the carbon ions is one of optimization parameters in determining the accelerating mechanisms. The ESS was implemented by the Geant4 Monte Carlo toolkit. In order to optimize the hole size and position of the energy selection collimator, and magnetic field at ESS, these parameters were simulated for acquiring energy and dose distributions by changing each values. RESULTS The proton energy distributions had a poly-energetic distribution after passing through the ESS. As the magnetic field was increased, the mean energy of the proton beams also was increased. Also as the hole size was increased, the energy bandwidth of proton passed through the ESS was increased. The hole size and position of the energy selection collimator were effectively optimized to 2 cm and 5 cm from the z-axis, respectively. CONCLUSIONS We simulated laser-accelerated proton beams using ESS for generation of Bragg-peak. Our results suggest that the ESS with magnetic field variation can effectively generate a Bragg-peak suitable for use in proton radiation therapy. Our ESS can be applied to pencil beam scanning proton therapy.
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Min B, Kwak J, Lee J, Cho S, Park S, Yoo S, Chung K, Cho S, Lim Y, Shin D, Lee S, Kim J. SU-E-J-63: Feasibility Study of Proton Digital Tomosynthesis in Proton Beam Therapy. Med Phys 2012; 39:3666-3667. [DOI: 10.1118/1.4734898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Bang S, Yoo S, Yang TJ, Cho H, Hwang SW. 17(R)-resolvin D1 specifically inhibits transient receptor potential ion channel vanilloid 3 leading to peripheral antinociception. Br J Pharmacol 2012; 165:683-92. [PMID: 21718307 DOI: 10.1111/j.1476-5381.2011.01568.x] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE Transient receptor potential ion channel vanilloid 3 (TRPV3) is expressed in skin keratinocytes and plays an important role in thermal and chemical nociceptions in the periphery. The presence of TRPV3 inhibitors would improve our understanding of TRPV3 function and help to develop receptor-specific analgesics. However, little is known about physiological substances that specifically inhibit TRPV3 activity. Here, we investigated whether 17(R)-resolvin D1 (17R-RvD1), a naturally occurring pro-resolving lipid specifically affects TRPV3 activity. EXPERIMENTAL APPROACH We examined the effect of 17R-RvD1 on sensory TRP channels using Ca(2+) imaging and whole cell electrophysiology experiments in a HEK cell heterologous expression system, cultured sensory neurons and keratinocytes. We also examined changes in sensory TRP agonist-specific acute licking/flicking or flinching behaviours and mechanical and thermal pain behaviours using Hargreaves, Randall-Selitto and von Frey assay systems in the absence and presence of inflammation. KEY RESULTS We showed that 17R-RvD1 specifically suppresses TRPV3-mediated activity at nanomolar and micromolar concentrations. The voltage-dependence of TRPV3 activation by camphor was shifted rightwards by 17R-RvD1, which indicates its inhibitory mechanism is as a result of a shift in voltage-dependence. Consistently, TRPV3-specific acute pain behaviours were attenuated by locally injected 17R-RvD1. Moreover, the administration of 17R-RvD1 significantly reversed the thermal hypersensitivity that occurs during an inflammatory response. Knockdown of epidermal TRPV3 blunted these antinociceptive effects of 17R-RvD1. CONCLUSIONS AND IMPLICATIONS 17R-RvD1 is a novel natural inhibitory substance specific for TRPV3. The results of our behavioural studies suggest that 17R-RvD1 has acute analgesic potential via TRPV3-specific mechanisms.
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Choi D, Yoo S, Song C, Hong JH, Kim CS, Ahn H. 1428 RISK STRATIFICATION MODEL FOR CHRONIC KIDNEY DISEASE STAGE III OR GREATER AFTER RADICAL NEPHRECTOMY IN T1B RENAL CELL CARCINOMA: IMPLICATIONS FOR PARTIAL NEPHRECTOMY. J Urol 2012. [DOI: 10.1016/j.juro.2012.02.1901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Yoo S, O'Daniel J, Horton J, Blitzblau R, Yin F. A Dual-Isocenter Technique for Image Guidance of Prone-Breast Radiation Therapy. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1454] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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141
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Zagar T, Palta M, Catalano S, O′Neill L, Yoo S, Leonard P, Horton J. Dosimetric Comparison Of Radiotherapy For Left Sided Breast Cancer: Breath-hold versus Free Breathing. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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142
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Grosse-Wortmann L, Govindapillai S, Etoom Y, Moshonov H, Hamilton R, Yoo S. 446 Magnetic resonance imaging in the diagnosis of childhood arrhythmogenic right ventricular cardiomyopathy. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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143
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Yoo S, You D, Jeong IG, Hong JH, Ahn H, Kim CS. Does radical cystectomy improve overall survival in octogenarians with muscle-invasive bladder cancer? Korean J Urol 2011; 52:446-51. [PMID: 21860763 PMCID: PMC3151630 DOI: 10.4111/kju.2011.52.7.446] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
PURPOSE We compared the efficacy of radical cystectomy (RC) and non-RC treatment [transurethral resection of bladder tumor (TURB) only, partial cystectomy, or TURB followed by radiotherapy] in octogenarians with muscle-invasive bladder cancer (MIBC). MATERIALS AND METHODS A total of 177 patients aged 80 years or more underwent TURB at our institute, and 41 patients had MIBC according to the histologic examination. Fourteen patients with lymph node or distant metastasis were excluded, and 27 patients were ultimately included. Patients were stratified by treatment modality (RC vs. non-RC), Charlson Comorbidity Index (low CCI vs. high CCI), and clinical tumor stage (organ-confined disease vs. extravesical disease). The effects of several variables on cancer-specific and overall survival were assessed. RESULTS Of the 27 patients, 11 (41%) underwent RC and 16 (59%) underwent non-RC treatment. Patients in the RC group were younger and more likely to have low CCI scores. There were no significant differences in overall or cancer-specific survival in the RC and non-RC groups. Patients with clinically organ-confined disease had better survival outcomes than did those with extravesical disease. Stratification of patients by CCI indicated that overall survival was better in patients with low CCI scores (p=0.013), although cancer-specific survival was similar in the two CCI groups. Univariate and multivariate analysis indicated that clinical tumor stage and CCI were independently associated with overall survival. CONCLUSIONS RC in octogenarians with MIBC does not improve overall survival compared with other treatment modalities. However, clinically organ-confined disease and low CCI score were associated with better overall survival.
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Yoo S, Murata RM, Duarte S. Antimicrobial traits of tea- and cranberry-derived polyphenols against Streptococcus mutans. Caries Res 2011; 45:327-35. [PMID: 21720161 PMCID: PMC3130978 DOI: 10.1159/000329181] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Accepted: 05/07/2011] [Indexed: 11/26/2022] Open
Abstract
There are over 750 species of bacteria that inhabit the human oral cavity, but only a small fraction of those are attributed to causing plaque-related diseases such as caries. Streptococcus mutans is accepted as the main cariogenic agent and there is substantial knowledge regarding the specific virulence factors that render the organism a pathogen. There has been rising interest in alternative, target-specific treatment options as opposed to nonspecific mechanical plaque removal or application of broad-spectrum antibacterials that are currently in use. The impact of diet on oral health is undeniable, and this is directly observable in populations that consume high quantities of polyphenol-rich foods or beverages. Such populations have low caries incidence and better overall oral health. Camellia sinensis, the plant from which various forms of tea are derived, and Vaccinium macrocarpon (American cranberry fruit) have received notable attention both for their prevalence in the human diet as well as for their unique composition of polyphenols. The biologically active constituents of these plants have demonstrated potent enzyme-inhibitory properties without being bactericidal, a key quality that is important in developing therapies that will not cause microorganisms to develop resistance. The aim of this review is to consider studies that have investigated the feasibility of tea, cranberry, and other select plant derivatives as a potential basis for alternative therapeutic agents against Streptococcus mutans and to evaluate their current and future clinical relevance.
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Yoo S, Kim D, Min B, Jeong H, Shin D, Lee S, Park S. SU-E-T-423: Feasibility and Parameter Study on the Radiation Therapy with Laser-Accelerated Electrons Using a Sharp Density Transition Scheme. Med Phys 2011. [DOI: 10.1118/1.3612377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Min B, Kim D, Yoo S, Jeong H, Lee S, Shin D, Lee S, Park S. SU-E-T-628: Dosimetric Evaluation of Proton Arc Therapy for Brain Stereotactic Radiotherapy. Med Phys 2011. [DOI: 10.1118/1.3612591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Kim S, Lee S, Yoo S, Cho S, Kim D, Lee S, Kim D, Park S, Shin J, Shin D, Park S. SU-E-T-235: Evaluation of Dosimetric Properties of Plastic Detectors in Proton Beam Therapy. Med Phys 2011. [DOI: 10.1118/1.3612185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Jeong H, Shin D, Lee S, Yoo S, Min B. SU-E-I-65: Estimation of Secondary Cancer Risk Induced by Diagnostic Imaging Radiations during Proton Therapy. Med Phys 2011. [DOI: 10.1118/1.3611638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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149
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Shin D, Jeong H, Min B, Yoo S, Park S, Lee S. SU-E-J-141: The Development of Real Time Automatic Patient Position Correction System. Med Phys 2011. [DOI: 10.1118/1.3611909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Cai J, Chang Z, OˈDaniel J, Yoo S, Jian Y, Ge H, Yin F. TU-E-BRC-08: Investigation of Anatomical Surrogate for 4DCT Imaging. Med Phys 2011. [DOI: 10.1118/1.3613195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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