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Hooser SD, Heimel JAF, Chung S, Nelson SB. Receptive field properties and laminar organization in the lateral geniculate nucleus of the gray squirrel (sciurus carolinensis). J Vis 2010. [DOI: 10.1167/3.9.369] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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177
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Jhoo JH, Yoon IY, Kim YK, Chung S, Kim JM, Lee SB, Kim TH, Moon SH, Kim SE, Kim KW. Availability of brain serotonin transporters in patients with restless legs syndrome. Neurology 2010; 74:513-8. [PMID: 20142619 DOI: 10.1212/wnl.0b013e3181cef824] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Selective serotonin reuptake inhibitors have been associated with the risk of restless legs syndrome (RLS), suggesting that dysregulation of serotonergic neurotransmission may provoke or exacerbate RLS. METHODS We compared the availability of serotonin transporter (SERT) between 16 drug-naïve patients with RLS and 16 healthy controls. SERT was measured in the pons and medulla via [(123)I]-2beta-carbomethoxy-3beta-(4-iodophenyl) tropane (beta-CIT) SPECT. A ratio of specific to nonspecific brain uptake (V(3)'') was used for all comparisons. RLS was diagnosed according to the criteria proposed by the National Institute of Health, and its severity was measured using the International RLS Study Group (IRLSSG) Severity Scale. RESULTS The availability of SERT was similar in the RLS group and the control group with regards to the pons (1.24 +/- 0.31 vs 1.24 +/- 0.25, p > 0.1) and the medulla (0.99 +/- 0.25 vs 1.00 +/- 0.23, p > 0.1). However, IRLSSG Severity Scale scores increased with decrease of SERT availability in both the pons (beta = -0.50, t = -3.19, p = 0.009) and the medulla (beta = -0.42, t = -2.44, p = 0.03). CONCLUSIONS Although serotonin transporter (SERT) availability in pons and medulla was similar in the restless legs syndrome (RLS) group and the control group, the severity of RLS symptoms increased as the availability of SERT decreased. These data partially support the hypothesis that an increase of serotonergic neurotransmission in the brainstem may exacerbate RLS, possibly via dual modulations on striatal dopaminergic neurotransmission and on the activities of spinal motor and sensory neurons.
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Chung S, Champagne E. Using Magnetic Beads to Reduce Peanut Allergens from Peanut Extracts. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.873] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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179
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180
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Yoo E, Song J, Kim H, Chung S. The Incidence of Isolated Testicular Relapse after Stem Cell Transplantation with Total Body Irradiation without Testicular Boost. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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181
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Chung S, Park Y, Jeon S, Kim Y, Kwon J. P225 The influence of delivery mode on the regression of abnormal cytology of cervix. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)61715-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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182
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Chung S, Lee K, Yu H. UP-1.192: Pattern of Voiding Dysfunction in Sjögren's Syndrome Patients. Urology 2009. [DOI: 10.1016/j.urology.2009.07.639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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183
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Chung S, Park CW, Chang YS. Renal infarction and rapidly progressive arterial thromboembolism following a percutaneous renal biopsy. CASE REPORTS 2009; 2009:bcr06.2009.1930. [DOI: 10.1136/bcr.06.2009.1930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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184
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Chung S, Tai W, Ravi K, Tan I, Tan M, Ngeow J, Koo Y, Tao M, Quek R, Lim S. 9212 Rituximab does not seem to influence the risk of central nervous system occurrence in patients with diffuse large B cell lymphoma. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71903-2] [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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185
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Mandelli ML, Berman J, Amirbekian B, Chung S, Maccagnano EC, Berger MS, Henry RG. Probabilistic Tracking can improve the delineation of cortico-spinal tract for neurosurgical planning. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70460-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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186
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Chung S, Furihata M, Tamura K, Uemura M, Daigo Y, Nasu Y, Miki T, Shuin T, Fujioka T, Nakamura Y, Nakagawa H. Overexpressing PKIB in prostate cancer promotes its aggressiveness by linking between PKA and Akt pathways. Oncogene 2009; 28:2849-59. [DOI: 10.1038/onc.2009.144] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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187
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Cerussi A, Tanamai W, Chung S, Hsiang D, Kukreti S, Mehta R, Gratton E, Tromberg B. TU-E-303A-02: Breast Cancer Applications of Optical Imaging Biomarkers Measured with Diffuse Optical Spectroscopic Imaging. Med Phys 2009. [DOI: 10.1118/1.3182423] [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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188
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Choi YM, Jang JY, Jang M, Kim SH, Kang YK, Cho H, Chung S, Park MK. Modulation of firing activity by ATP in dopamine neurons of the rat substantia nigra pars compacta. Neuroscience 2009; 160:587-95. [PMID: 19272429 DOI: 10.1016/j.neuroscience.2009.02.067] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2008] [Revised: 02/12/2009] [Accepted: 02/27/2009] [Indexed: 11/26/2022]
Abstract
ATP acts as a neurotransmitter or co-neurotransmitter in many areas of the CNS and peripheral nervous systems; however, little is known about the expression and functional role of purinoceptors (P2) in midbrain dopaminergic neurons. Therefore, we investigated P2X receptor expression and regulation of spontaneous firing activity in dopaminergic neurons of the substantia nigra pars compacta (SNc) in rats using patch-clamp and Ca(2+)-imaging techniques. In most neurons, application of ATP (1 microM-1 mM) increased firing rate dose-dependently (EC(50)=1.26+/-0.26 microM, n=45). When the P2-receptor agonists such as 2-methylthio-adenosine 5'-triphosphate (2-MeSATP) or ATPgammaS were applied or pressure-applied to the neuron, the firing activity increased together with a rise in cytosolic Ca(2+) concentration ([Ca(2+)]c), but application of beta,gamma-methylene ATP (P2X(1, 3) agonist) or methylthio-adenosine 5'-diphosphate (P2Y(1) agonist) had no effect. In many neurons, the effect of ATP was abolished by the application of the P2-receptor antagonists, suramin or pyridoxal-phosphate-6-azophenyl-2',4'-disulfonic acid (PPADS). When ATP was applied in a Ca(2+)-free solution, there was no detectable change in [Ca(2+)]c, suggesting that ATP does not release Ca(2+) from intracellular stores. In the single-cell reverse transcription polymerase chain reaction (RT-PCR), we found that 65% of dopaminergic neurons expressed mRNAs for P2X receptors; positive amplifications of P2X(6) (57.1%), P2X(2/6) (25.0%), and P2X(4) mRNA (17.9%), respectively. From the above results, we could conclude that ATP modulates firing activities in the rat SNc dopaminergic neurons, possibly via P2X(2), P2X(2/6), and/or P2X(4) receptors.
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Chung S, Cerussi A, Mehta R, Hsiang D, Tromberg B. Non-invasive detection and monitoring of tumor pathological grade during neoadjuvant chemotherapy by measuring tissue water state using diffuse optical spectroscopic imaging. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Abstract #803
Background: Changes of tissue water state are related to physiological and pathological properties of breast tissues. For instance, MRI has measured water mobility in order to monitor local micro-structural changes in breast cancer tissues during chemotherapy. Diffuse Optical Spectroscopic Imaging (DOSI) measures water molecular vibrational states associated with macro-molecular complexes in tissues such as proteins. For DOSI measurements, breast tumors are line-scanned and spectral information on each point is spatially mapped to generate an image.
 Subjects & Methods: DOSI was employed to measure 15 infiltrating ductal carcinoma (IDC) patients before treatment. Five IDC and one infiltrating lobular carcinoma (ILC) tumors were also measured along the course of neoadjuvant chemotherapy. Patient responses were determined from standard pathology: complete (N=2), partial (N=2) and non-responders (N=2). The spectral features of tissue water absorption from 935 nm to 998nm were compared to those of a pure water spectrum measured at body temperature in order to acquire the Bound Water Index (BWI: the residual between tissue and pure water spectra). In spectroscopic images, the Cancer BWI Ratio (CBR) was calculated by counting the fraction of the BWI less than 20% of the BWI range of pre-chemo (baseline) measurement in a primary cancer. Lower BWI means the cancer has more free water. The CBR communicates the changes of tissue water state along the course of therapies in the similar way to Signal Enhanced Ratio (SER) used in contrast enhanced MRI.
 Results: In our in vivo clinical studies with 15 IDC tumors, a high inverse correlation between BWI and Nottingham Bloom-Richardson histopathological score (R=-0.87) was found. In the neoadjuvant chemotherapy studies, BWI increased during the entire course of the therapy in complete responders while it fluctuated then stayed close to baseline values in partial responders. In non-responders, the change amount of BWI was very small and the BWI values decreased below baseline values. Quantitatively, for complete responders, BWI increased (more bound water) 59% from baseline and CBR decreased (less pixels for cancer) 26.9% and the pixels presenting cancer property disappeared. In partial responders, BWI increased 4.7% and CBR decreased 8.2% whereas, in non-responders, BWI decreased 16.4% and CBR increased 28.7%.
 Discussion: The high correlation between BWI and histopathological score communicates that water state measurements using DOSI report on disease grades of breast cancer non-invasively. In the neoadjuvant chemotherapy studies, bigger tissue water state changes have been measured in complete than partial responders and the changes to the opposite direction in non-responders. There results demonstrate a potential of tissue water state with DOSI as a non-invasive pathological grade monitor during chemotherapy, which can be used as a substitute for a biopsy at any point during the treatment cycle.
Citation Information: Cancer Res 2009;69(2 Suppl):Abstract nr 803.
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Shin HW, Rha YC, Han DH, Chung S, Yoon IY, Rhee CS, Lee CH, Min YG, Kim DY. Erectile dysfunction and disease-specific quality of life in patients with obstructive sleep apnea. Int J Impot Res 2008; 20:549-53. [DOI: 10.1038/ijir.2008.39] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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191
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Park H, Chung S. Structural investigation of the Ba-doped LaInO 3. Acta Crystallogr A 2008. [DOI: 10.1107/s010876730808286x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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192
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Kim H, Chung S. Calculation of graphs representing crystal structures. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308084225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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193
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Gonzalez SA, Zhang C, Fiel MI, Chung S, Zhang L, Jacobson IM, Talal AH. Hepatic inflammatory cytokine mRNA expression in hepatitis C virus-human immunodeficiency virus co-infection. J Viral Hepat 2008; 15:331-8. [PMID: 18179452 DOI: 10.1111/j.1365-2893.2007.00949.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Although epidemiologic studies have documented that hepatitis C virus (HCV)/human immunodeficiency virus (HIV) co-infected patients have accelerated fibrogenesis, especially those with CD4+ cell counts <200 cells/mm(3), the pathogenic mechanisms are poorly understood. We investigated whether severe immunodeficiency in co-infection is associated with changes in intrahepatic inflammatory cytokine mRNA levels. We measured interferon (IFN)-gamma, tumour necrosis factor-alpha, transforming growth factor (TGF)-beta(1), interleukin (IL)-4, IL-10, IL-12p35 and IL-12p40 mRNA levels by real-time PCR performed on liver samples from HCV mono-infected (n = 19) and HCV/HIV co-infected (n = 24) patients. Co-infected patients had decreased intrahepatic mRNA levels of IFN-gamma (P = 0.09), IL-4 (P = 0.05) and IL-12p35 (P = 0.04) compared with mono-infected patients, while IL-10 was increased (P = 0.07). In co-infected patients, IFN-gamma mRNA levels increased linearly with increasing peripheral CD4+ cell counts by 1.23 times relative to the calibrator for every 100 CD4+ cells/mm(3) increase (P = 0.02). No other cytokines were significantly associated with CD4+ cell counts. In conclusion, HIV-induced lymphopenia may result in hepatic inflammatory cytokine suppression in HCV/HIV co-infection. Intrahepatic IFN-gamma levels are significantly reduced in patients with advanced immunodeficiency. Further studies are needed to assess whether decreased IFN-gamma secretion by HCV-specific CD4+ cells may account for accelerated fibrogenesis in these patients.
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Ozbaydar M, Chung S, Diller D, Warner JJP. [Arthroscopic reconstruction of the rotator cuff. The current gold standard?]. DER ORTHOPADE 2008; 36:825-33. [PMID: 17701159 DOI: 10.1007/s00132-007-1134-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Arthroscopic rotator cuff repair has become the gold standard, and is now accepted throughout the world as the method of choice, for rotator cuff repair. As well as an experienced surgeon and meticulously correct arthroscopic technique, careful patient selection and adequate postoperative management are of decisive importance if a good postoperative outcome is to be achieved. With due consideration for all these factors the success rate is over 90%, as measured not only with reference to objective criteria, but also by patients' reports of their how satisfied they are with the result. This paper aims to report the indications, arthroscopic technique and postoperative protocol, and also the results of arthroscopic rotator cuff repair.
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Abstract
Orphan G protein-coupled receptors (GPCRs) are receptors lacking endogenous ligands. Found by molecular biological analyses, they became the roots of reverse pharmacology, in which receptors are attempted to be matched to potential transmitters. Later, when high-throughput screening technology was applied to reverse pharmacology, dozens of orphan GPCRs became deorphanized. Furthermore, novel neuropeptides were discovered. This review retraces the history of the orphan GPCRs and of the discoveries of their endogenous ligands, it also discusses the difficulties that the search for new ligands is presently encountering.
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Mowbray DJ, Chung S, Mišković ZL, Goodman FO. Channelling of dipolar molecules through carbon nanotubes. NANOTECHNOLOGY 2007; 18:424034. [PMID: 21730466 DOI: 10.1088/0957-4484/18/42/424034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We study the dynamic polarization of carbon nanotubes caused by the propagation of fast electric dipoles under channelling conditions. We specifically analyse the position and orientation dependences of the dipole self-energy, stopping force, and the torque about the dipole centre. It is found that a dipole is strongly attracted to the nanotube wall and shows a tendency to orient itself perpendicular to the direction of motion. The stopping force shows more complex behaviour, but is generally found to be larger close to the nanotube wall and when oriented in the perpendicular direction at higher speeds.
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Chung S, Chueh S, Yu H. MP-16.04: Prognostic factors for bladder recurrence after nephroureterectomy for upper tract urothelial carcinoma. Urology 2007. [DOI: 10.1016/j.urology.2007.06.465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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198
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Chung S, Chung H, Lee H. 48: Selection of Target Age for School Education in Cardiopulmonary Resuscitation. Ann Emerg Med 2007. [DOI: 10.1016/j.annemergmed.2007.06.079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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199
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Arrell DK, Niederländer NJ, Perez-Terzic C, Chung S, Behfar A, Terzic A. Pharmacoproteomics: advancing the efficacy and safety of regenerative therapeutics. Clin Pharmacol Ther 2007; 82:316-9. [PMID: 17671447 DOI: 10.1038/sj.clpt.6100310] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Proteomic analyses encompass a suite of high-throughput technologies for large-scale separation and identification of proteins responsible for execution of physiological processes. As such, proteomics is ideally suited to dissecting developmental complexity and dynamics, an understanding of which is vital to the realization of regenerative therapeutic medicine. Pharmacoproteomics is increasingly targeting characterization of regenerative therapeutic strategies. A perspective on the application of proteomics to further our understanding of cardiac regenerative medicine, in concert with guided cardiogenic programming, is delineated herein.
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Jacobson GA, Narkowicz C, Lord R, Howard BJ, Chung S. Effect of celecoxib on cyclooxygenase-2 expression and possible variants in a patient with Barrett's esophagus. Dis Esophagus 2007; 20:265-8. [PMID: 17509125 DOI: 10.1111/j.1442-2050.2007.00684.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Cyclooxygenase-2 (COX-2) expression is increased in metaplastic and dysplastic Barrett's esophageal epithelium and it is thought that selective COX-2 inhibitors could offer hope as chemoprevention therapy. The aim of the study was to investigate the in vivo effect of celecoxib on COX-2 expression in patients with Barrett's esophagus and no recent history of non-steroidal anti-inflammatory drug use. Endoscopic mucosal biopsy specimens were collected at baseline and after 28 days of therapy in a patient treated with celecoxib 200 mg twice daily. Samples were analyzed for COX-2 expression by immunoblot analysis with chemiluminescence detection. COX-2 expression was found to decline 20% and 44% at two different biopsy sites compared to the baseline sample. Longer exposures revealed a number of previously unidentified proteins above and below the 67 kDa COX-2 protein including 38 kDa and 45 kDa proteins which were present only at study completion consistent with up-regulation after celecoxib therapy. Further investigations of the 38 kDa and 45 kDa proteins were undertaken using two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) with immunoblot and MALDI-TOF (matrix assisted laser desorption ionization - time of flight) analysis but no matches were found and results were inconclusive. Unmatched masses from MALDI-TOF peptide mass fingerprinting were compared with human COX-2 (67 kDa) and COX-2b (39 kDa) using unspecific cleavage. Peptide sequence homology with COX-2 and COX-2b was found for a length of 19 amino acids. Based on immunodetection, molecular weight and equivical MALDI-TOF results, one of these up-regulated proteins may be COX-2b.
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