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Kontantinou M, Armstrong A, Poulin Y, Foley P, Owczarek W, Bagel J, Papp K, Flavin S, Hsu M, Randazzo B, Reich K. Constance de la réponse selon l’âge chez des patients atteints de psoriasis modéré à sévère traités par guselkumab vs sécukinumab : résultats de l’étude ECLIPSE à la 48e semaine. Ann Dermatol Venereol 2019. [DOI: 10.1016/j.annder.2019.09.563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Konstantinou M, Langley R, Weisman J, Martorell A, Fernandez-Penas P, Hong C, Flavin S, Hsu M, Randazzo B, Armstrong A. Constance de la réponse selon les caractéristiques de sévérité de la maladie chez les patients atteints de psoriasis modéré à sévère traités par le guselkumab par rapport au sécukinumab : résultats de l’étude ECLIPSE à la semaine 48. Ann Dermatol Venereol 2019. [DOI: 10.1016/j.annder.2019.09.564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Konstantinou M, Armstrong A, Blauvelt A, Flavin S, Hsu M, Randazzo B, Reich K, Langley R. Constance de la réponse selon les quartiles de poids et les catégories de masse corporelle : résultats de l’étude ECLIPSE à la semaine 48. Ann Dermatol Venereol 2019. [DOI: 10.1016/j.annder.2019.09.565] [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: 11/17/2022]
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Konstantinou M, Reich K, Soung J, Maari C, Gebauer K, Thaci D, Flavin S, Hsu M, Randazzo B, Blauvelt A. Amélioration du score PASI absolu chez des patients atteints de psoriasis traités par le guselkumab ou le sécukinumab: résultats de l’étude ECLIPSE. Ann Dermatol Venereol 2019. [DOI: 10.1016/j.annder.2019.09.054] [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: 10/25/2022]
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6
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Blauvelt A, Ferris L, Yamauchi P, Qureshi A, Leonardi C, Farahi K, Fakharzadeh S, Hsu MC, Li S, Chevrier M, Smith K, Goyal K, Chen Y, Muñoz-Elías E, Callis Duffin K. Extension of ustekinumab maintenance dosing interval in moderate-to-severe psoriasis: results of a phase IIIb, randomized, double-blinded, active-controlled, multicentre study (PSTELLAR). Br J Dermatol 2017; 177:1552-1561. [DOI: 10.1111/bjd.15722] [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] [Accepted: 06/06/2017] [Indexed: 11/29/2022]
Affiliation(s)
- A. Blauvelt
- Oregon Medical Research Center; Portland OR U.S.A
| | - L.K. Ferris
- Department of Dermatology; University of Pittsburgh; Pittsburgh PA U.S.A
| | - P.S. Yamauchi
- Dermatology Institute and Skin Care Center; Santa Monica CA U.S.A
- Geffen School of Medicine at UCLA; Los Angeles CA U.S.A
| | - A. Qureshi
- Dermatology; Warren Alport Medical School of Brown University; Rhode Island Hospital; Providence RI U.S.A
| | - C.L. Leonardi
- Dermatology; Saint Louis University School of Medicine; Saint Louis MO U.S.A
| | - K. Farahi
- Janssen Pharmaceuticals Inc.; Horsham PA U.S.A
| | | | - M.-C. Hsu
- Janssen Research & Development LLC; Spring House PA U.S.A
| | - S. Li
- Janssen Research & Development LLC; Spring House PA U.S.A
| | - M. Chevrier
- Janssen Research & Development LLC; Spring House PA U.S.A
| | - K. Smith
- Janssen Research & Development LLC; Titusville NJ U.S.A
| | - K. Goyal
- Janssen Research & Development LLC; Horsham PA U.S.A
| | - Y. Chen
- Janssen Research & Development LLC; San Diego CA U.S.A
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7
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Wen CP, Liu CH, Jeng JS, Hsu SP, Chen CH, Lien LM, Chen AC, Lee JT, Chen PK, Hsu CS, Chern CM, Chen CC, Hsu MC, Lu K, Chen HJ, Wang HK, Muo CH, Hsu CY. Pre-stroke physical activity is associated with fewer post-stroke complications, lower mortality and a better long-term outcome. Eur J Neurol 2017; 24:1525-1531. [PMID: 28926165 DOI: 10.1111/ene.13463] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 09/11/2017] [Indexed: 11/29/2022]
Affiliation(s)
- C.-P. Wen
- Institute of Population Health Sciences; National Health Research Institutes; Zhunan Taiwan
- Graduate Institute of Biomedical Sciences; College of Medicine; China Medical University; Taichung Taiwan
- Department of Medical Research; China Medical University Hospital; Taichung Taiwan
| | - C.-H. Liu
- Department of Neurology; China Medical University Hospital; Taichung Taiwan
| | - J.-S. Jeng
- Department of Neurology; National Taiwan University Hospital; Taipei Taiwan
| | - S.-P. Hsu
- Department of Neurology; E-Da Hospital / I-Shou University; Kaohsiung Taiwan
| | - C.-H. Chen
- Department of Neurology; College of Medicine; National Cheng Kung University; Tainan Taiwan
| | - L.-M. Lien
- Department of Neurology; Shin Kong Wu Ho-Su Memorial Hospital; Taipei Medical University College of Medicine; Taipei Taiwan
| | - A.-C. Chen
- Department Neurology; Chung Shan Medical University Hospital; Taichung Taiwan
| | - J.-T. Lee
- Department of Neurology; Tri-Service General Hospital; National Defense Medical Center; Taipei Taiwan
| | - P.-K. Chen
- Department of Neurology; Lin Shin Hospital; Taichung Taiwan
| | - C.-S. Hsu
- China Medical University Beigang Hospital; Yunlin Taiwan
| | - C.-M. Chern
- Taipei Veterans General Hospital; School of Medicine; National Yang-Ming University; Taipei Taiwan
| | - C.-C. Chen
- St. Martin De Porres Hospital; Chiayi Taiwan
| | - M.-C. Hsu
- Buddhist Dalin Tzu Chi General Hospital; Chiayi Taiwan
| | - K. Lu
- Department of Neurosurgery; E-Da Hospital/ I-Shou University; Kaohsiung Taiwan
| | - H.-J. Chen
- Department of Neurosurgery; E-Da Hospital/ I-Shou University; Kaohsiung Taiwan
| | - H.-K. Wang
- Department of Neurosurgery; E-Da Hospital/ I-Shou University; Kaohsiung Taiwan
| | - C.-H. Muo
- Department of Medical Research; China Medical University Hospital; Taichung Taiwan
| | - C.-Y. Hsu
- Department of Neurology; China Medical University Hospital; Taichung Taiwan
- Graduate Institute of Clinical Medical Science; China Medical University; Taichung Taiwan
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8
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Abstract
The high prevalence of C. trachomatis worldwide has underscored the importance of identifying specific immunogenic antigens in facilitating diagnosis as well as vaccine development The aim of this study is to evaluate IncA antibody and antigen production in natural human infections. Our temporal expression study showed that IncA transcription and protein expression could be detected as early as 4 hours after the start of infection. Antibody responses could be detected in urine and genital swab samples from C. trachomatis-positive patients. It is especially interesting to note that the IncA antigen could be detected in urine. In conclusion, we have identified IncA as an important antigen in human. The potential applicability of the IncA antibody or antigen in the diagnosis as well as to vaccine development for C. trachomatis is also discussed.
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Affiliation(s)
- P.Y. Tsai
- Mycotic Diseases Laboratory, Research and Diagnostics Center, Centers for Disease Control, Taipei
- Institute of Biopharmaceutical Sciences, National Yang-Ming University, Taipei, Taiwan
| | - M.C. Hsu
- Mycotic Diseases Laboratory, Research and Diagnostics Center, Centers for Disease Control, Taipei
| | - C.T. Huang
- Mycotic Diseases Laboratory, Research and Diagnostics Center, Centers for Disease Control, Taipei
| | - S.Y. Li
- Mycotic Diseases Laboratory, Research and Diagnostics Center, Centers for Disease Control, Taipei
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9
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Coffen DL, Huang TN, Ramer SE, West RC, Connell EV, Schutt AD, Hsu MC. Discovery of a Drug Lead Employing a Peptide Library: Inhibition of HIV-1 Tat and Viral Replication by the Tripeptide YPG-NH2. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029400500210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A library of the 8000 tripeptides derivable from coded amino acids was prepared in 20 sets of 400 using solid phase synthesis on a benzhydrylamine resin. The peptide mixtures, as C-terminal amides, were screened for inhibition of secreted alkaline phosphatase expression in a cellular (COS) system wherein a transfected SeAP gene construct was under control of the HIV-1 LTR promoter, activated by the product of a cotransfected HIV Tat gene construct. Thus, YPG-NH2 was discovered as an inhibitor of HIV-1 Tat function and then shown to block HIV replication in a CD4+ T-cell line (CEM) with IC50 = 35μM.
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Affiliation(s)
- D. L. Coffen
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
| | - T.-N. Huang
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
| | - S. E. Ramer
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
| | - R. C. West
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
| | - E. V. Connell
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
| | - A. D. Schutt
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
| | - M.-C. Hsu
- Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA
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10
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Langley R, Lebwohl M, Krueger G, Szapary P, Wasfi Y, Chan D, Hsu M, You Y, Poulin Y, Korman N, Prinz J, Reich K. Long‐term efficacy and safety of ustekinumab, with and without dosing adjustment, in patients with moderate‐to‐severe psoriasis: results from the PHOENIX 2 study through 5 years of follow‐up. Br J Dermatol 2015; 172:1371-83. [DOI: 10.1111/bjd.13469] [Citation(s) in RCA: 153] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2014] [Indexed: 11/30/2022]
Affiliation(s)
- R.G. Langley
- Dalhousie University 4195 Dickson Building 5820 University Avenue Halifax NS Canada
| | - M. Lebwohl
- Icahn School of Medicine at Mount Sinai New York NY U.S.A
| | - G.G. Krueger
- University of Utah Health Sciences Center Salt Lake City UT U.S.A
| | - P.O. Szapary
- Janssen Research & Development, LLC Spring House PA U.S.A
| | - Y. Wasfi
- Janssen Research & Development, LLC Spring House PA U.S.A
| | - D. Chan
- Janssen Research & Development, LLC Spring House PA U.S.A
| | - M.C. Hsu
- Janssen Research & Development, LLC Spring House PA U.S.A
| | - Y. You
- Janssen Research & Development, LLC Spring House PA U.S.A
| | - Y. Poulin
- Centre de Recherche Dermatologique du Quebec Metropolitain Universite Laval Quebec City QC Canada
| | - N. Korman
- University Hospitals Case Medical Center Cleveland OH U.S.A
| | | | - K. Reich
- Dermatologikum Hamburg Hamburg Germany
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11
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Huang CW, Hung TY, Liao YK, Hsu MC, Wu SN. Underlying mechanism of regulatory actions of diclofenac, a nonsteroidal anti-inflammatory agent, on neuronal potassium channels and firing: an experimental and theoretical study. J Physiol Pharmacol 2013; 64:269-280. [PMID: 23959723] [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] [Received: 02/04/2013] [Accepted: 06/27/2013] [Indexed: 06/02/2023]
Abstract
Diclofenac (DIC), a nonsteroidal anti-inflammatory drug, is known to exert anti-nociceptive and anti-convulsant actions; however, its effects on ion currents, in neurons remain debatable. We aimed to investigate (1) potential effects of diclofenac on membrane potential and potassium currents in differentiated NSC-34 neuronal cells and dorsal root ganglion (DRG) neurons with whole-cell patch-clamp technology, and (2) firing of action potentials (APs), using a simulation model from hippocampal CA1 pyramidal neurons based on diclofenac's effects on potassium currents. In the NSC-34 cells, diclofenac exerted an inhibitory effect on delayed-rectifier K⁺ current (I(KDR)) with an IC₅₀ value of 73 μM. Diclofenac not merely inhibited the I(KDR) amplitude in response to membrane depolarization, but also accelerated the process of current inactivation. The inhibition by diclofenac of IK(DR) was not reversed by subsequent application of either naloxone. Importantly, diclofenac (300 μM) increased the amplitude of M-type K⁺ current (I)(KM)), while flupirtine (10 μM) or meclofenamic acid (10 μM) enhanced it effectively. Consistently, diclofenac (100 μM) increased the amplitude of I(KM) and diminished the I(KDR) amplitude, with a shortening of inactivation time constant in DRG neurons. Furthermore, by using the simulation modeling, we demonstrated the potential electrophysiological mechanisms underlying changes in AP firing caused by diclofenac. During the exposure to diclofenac, the actions on both I(KM) and I(KDR) could be potential mechanism through which it influences the excitability of fast-spiking neurons. Caution needs to be made in attributing the effects of diclofenac primarily to those produced by the activation of I(KM).
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Affiliation(s)
- C W Huang
- Department of Neurology, National Cheng Kung University Hospital, School of Medicine, National Cheng Kung University, Tainan City, Taiwan
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12
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Brodmerkel C, Langley R, Papp K, Bourcier M, Poulin Y, Ho V, Guenther L, Hsu MC, Szapary P. Le traitement à long terme par l’ustekinumab ne compromet pas la réponse immunitaire à des vaccins T dépendant ou T indépendant chez les patients avec un psoriasis modéré à sévère : comparaison de patients psoriasiques traités par l’ustekinumab versus des témoins. Ann Dermatol Venereol 2012. [DOI: 10.1016/j.annder.2012.10.522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Reich K, Langley R, Lebwohl M, Szapary P, Yeilding N, Hsu MC, Griffiths C, Quiniou JB. Mise à jour des données de tolérance cardiovasculaire poolées des études de phase 2 et 3 de l’ustekinumab dans le psoriasis jusqu’à 4 ans de suivi. Ann Dermatol Venereol 2011. [DOI: 10.1016/j.annder.2011.10.264] [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: 10/15/2022]
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14
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Hwang J, Ho H, Hsu M, Chen J. Effect of Transient Ischemic Attack on Hearing Thresholds of Older Subjects. Audiol Neurotol Extra 2011. [DOI: 10.1159/000329795] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Hsu MC, Peltier SJ, Welsh RC, Harris RE, Clauw DJ, Williams DA. Differences in Functional Connectivity to the Anterior Insula between Fibromyalgia Patients and Healthy Controls. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70626-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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16
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Sun GC, Hsu MC, Chia YY, Chen PY, Shaw FZ. Effects of age and gender on intravenous midazolam premedication: a randomized double-blind study. Br J Anaesth 2008; 101:632-9. [DOI: 10.1093/bja/aen251] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Tsai PY, Hsu MC, Huang CT, Li SY. Human antibody and antigen response to IncA antibody of Chlamydia trachomatis. Int J Immunopathol Pharmacol 2007; 20:156-61. [PMID: 17346439] [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: 05/14/2023] Open
Abstract
The high prevalence of C. trachomatis worldwide has underscored the importance of identifying specific immunogenic antigens in facilitating diagnosis as well as vaccine development. The aim of this study is to evaluate IncA antibody and antigen production in natural human infections. Our temporal expression study showed that IncA transcription and protein expression could be detected as early as 4 hours after the start of infection. Antibody responses could be detected in urine and genital swab samples from C. trachomatis-positive patients. It is especially interesting to note that the IncA antigen could be detected in urine. In conclusion, we have identified IncA as an important antigen in human. The potential applicability of the IncA antibody or antigen in the diagnosis as well as to vaccine development for C. trachomatis is also discussed.
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Affiliation(s)
- P Y Tsai
- Mycotic Diseases Laboratory, Research and Diagnostics Center, Centers for Disease Control, Taipei, Taiwan
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18
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19
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Wung BS, Wu CC, Hsu MC, Hsieh CW. 15-Deoxy-Δ12,14-prostaglandin J2 suppresses IL-6-induced STAT3 phosphorylation via electrophilic reactivity in endothelial cells. Life Sci 2006; 78:3035-42. [PMID: 16413037 DOI: 10.1016/j.lfs.2005.12.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2005] [Revised: 11/21/2005] [Accepted: 12/02/2005] [Indexed: 11/23/2022]
Abstract
In this study, the effects of 15d-PGJ(2) were investigated in IL-6-activated endothelial cells (ECs). 15d-PGJ(2) was found to abrogate phosphorylation on tyr705 of STAT3 in IL-6-treated ECs, in a dose- and time-dependent manner, but did not inhibit serine phosphorylation of STAT3 and the upperstream JAK2 phosphorylation. Other PPAR activators, such as WY1643 or ciglitazone, had no effect upon IL-6-induced STAT3 phosphorylation. Additionally, neither orthovanadate nor l-NAME treatment reverses the inhibition of STAT3 phosphorylation by 15d-PGJ(2). Otherwise, the effect of 15d-PGJ(2) requires the alpha,beta-unsaturated carbonyl group in the cyclopentane ring. A 15d-PGJ(2) analog, 9,10-Dihydro-15d-PGJ(2), which lack alpha,beta-unsaturated carbonyl group showed no increase in ROS production and no effect in inhibition of IL-6-induced STAT3 phosphorylation. The electrophilic compound, acrolein, mimics the inhibition effect of 15d-PGJ(2). Among the antioxidants, only NAC and glutathione reversed the effects of 15d-PGJ(2). NAC, glutathione and DTT all reversed the inhibition of STAT3 phosphorylation when preincubated with 15d-PGJ(2). The inhibition of ICAM-1 gene expression by 15d-PGJ(2) was abrogated by NAC and glutathione in IL-6-treated ECs. Taken together, these results suggest that 15d-PGJ(2) inhibits IL-6-stimulated phosphorylation on tyr705 of STAT3 dependent on its own electrophilic reactivity in ECs.
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Affiliation(s)
- B S Wung
- Department of Applied Microbiology, National Chiayi University, Chiayi, Taiwan.
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20
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Wu CC, Hsu MC, Hsieh CW, Lin JB, Lai PH, Wung BS. Upregulation of heme oxygenase-1 by Epigallocatechin-3-gallate via the phosphatidylinositol 3-kinase/Akt and ERK pathways. Life Sci 2005; 78:2889-97. [PMID: 16378625 DOI: 10.1016/j.lfs.2005.11.013] [Citation(s) in RCA: 166] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2005] [Accepted: 11/09/2005] [Indexed: 10/25/2022]
Abstract
Heme oxygenase-1 (HO-1) is a cytoprotective enzyme activated by various phytochemicals and we examined the ability of Epigallocatechin-3-gallate (EGCG), the major constituent of green tea, to upregulate HO-1 expression in endothelial cells (ECs). We demonstrate that EGCG induces HO-1 expression in a concentration- and time-dependent manner. Furthermore, EGCG-mediated HO-1 induction was abrogated in the presence of actinomycin D and cycloheximide, indicating that this upregulation of HO-1 occurred at the transcriptional level. EGCG also upregulates Nrf2 levels in nuclear extracts and increases ARE-luciferase activity. Furthermore, EGCG is the most potent inducer of HO-1 expression of the different green tea constituents that we analyzed, but had no detectable cytotoxic effects over the 25-100 microM dosage range. The inhibition of intracellular ROS production by N-acetylcysteine (NAC), glutathione (GSH), superoxide dismutase (SOD), catalase and the mitochondrial complex I inhibitor, rotenone, results in a decrease in EGCG-dependent HO-1 expression. In addition, we determined that tyrosine kinase is involved in EGCG induction of HO-1 as this is abrogated by genistein. ECs treated with EGCG exhibit activation of Akt and ERK1/2. In addition, pharmacological inhibitors of phosphatidylinositol 3-kinase and MEK1/2, which are upstream of Akt and ERK1/2, respectively, attenuate EGCG-induced HO-1 expression. On the other hand, pretreatment of these cells with EGCG exerts significant cytoprotective effects against H2O2, suggesting that the induction of HO-1 is an important component in the protection against oxidative stress. Hence, EGCG is a novel phytochemical inducer of HO-1 expression and we further identify the principal underlying mechanisms involved in this process.
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Affiliation(s)
- C C Wu
- Institute of Biotechnology, National Chiayi University, Chiayi, Taiwan
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21
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Wung BS, Hsu MC, Wu CC, Hsieh CW. Resveratrol suppresses IL-6-induced ICAM-1 gene expression in endothelial cells: effects on the inhibition of STAT3 phosphorylation. Life Sci 2005; 78:389-97. [PMID: 16150460 DOI: 10.1016/j.lfs.2005.04.052] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2004] [Accepted: 04/28/2005] [Indexed: 10/25/2022]
Abstract
Resveratrol, a polyphenolic phytoaxelin present in red wine, has been suggested to protect against atherosclerosis and cardiovascular disease because of its antioxidant effects. Intercellular adhesion molecule (ICAM-1), induced by cytokines, has been hypothesized to play a role in the early events during atherosclerosis. In this study we tested the effects of resveratrol upon both IL-6-induced ICAM-1 gene expression and its underlying signaling pathways in endothelial cells (ECs). Resveratrol was found to inhibit both TNFalpha- and IL-6-induced ICAM-1 gene expression at the promoter, transcriptional and protein levels. Resveratrol also abrogates the tyr705 phosphorylation of STAT3 in IL-6-treated ECs, in a dose- and time-dependent manner. Although quercetin had similar effects, resveratrol showed higher inhibitory properties following 2-4 h pretreatments. Resveratrol has been shown to induce the activity of endothelial nitric oxide synthase (eNOS) and increase NO production. Consistent with this, the treatment of ECs with a NO donor (SNAP) reduces IL-6-induced STAT3 phosphorylation. Conversely, exposure of ECs to a NOS inhibitor reversed the effects of resveratrol upon IL-6-induced STAT3 phosphorylation. Furthermore, ECs transfected with constitutively active Rac1 (RacV12) showed increases in ICAM-1 promoter activity, intracellular reactive oxygen species (ROS) levels and STAT3 phosphorylation, and these increases were attenuated by resveratrol treatment. In summary, we demonstrate for the first time that resveratrol inhibits IL-6-induced ICAM-1 gene expression, in part, by interfering with Rac-mediated pathways via the attenuation of STAT3 phosphorylation. This study therefore provides important new insights that may contribute to the proposed beneficial effects of resveratrol in endothelial responses to cytokines during inflammation.
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Affiliation(s)
- B S Wung
- Department of Applied Microbiology, National Chiayi University, Chiayi, Taiwan.
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22
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Abstract
We evaluated the eye blink rate (EBR) in healthy Chinese adults and Parkinson's disease (PD) patients. In healthy subjects, the EBR declined with age, was lower in women than men younger than 50 years of age, and did not differ from male PD patients older than 60 years or female PD patients older than 50 years. Accordingly, EBR is not a good indicator for bradykinesia in Chinese individual older than 50 years that is prevalent for PD onset also.
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Affiliation(s)
- W H Chen
- Department of Neurology, Chang Gung Memorial Hospital, 123 Ta Pei Road, Niao Sung Hsiang, Kaohsiung 833, Taiwan, ROC
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23
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Yang TL, Hsu MC, Liu CM. Nasal schwannoma: a case report and clinicopathologic analysis. Rhinology 2001; 39:169-72. [PMID: 11721510] [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: 02/22/2023]
Abstract
According to the literature, half of the schwannoma cases occur in the head and neck areas and only less than 4% occur in the sinonasal tract. In this case, a 39-year-old male patient, with a-year-long progressive left side nasal obstruction and purulent rhinorrhea, is presented. The CT reveals a mass filling the left nasal cavity and nasopharyngeal space, with bony erosion of the inferior turbinate and medial maxillary bone. During surgical intervention, the mass is found to originate from the medial side of the left middle turbinate with maxillary sinusitis and inferior turbinate atrophy. The pathological examination reveals a noncapsulated tumor with palisading cellular arrangement and high cellular density. The pathological findings and nervous origin of the tumor are discussed after an extensive review of the literature.
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Affiliation(s)
- T L Yang
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
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Chen CF, Wu KG, Hsu MC, Tang RB. Prevalence and relationship between allergic diseases and infectious diseases. J Microbiol Immunol Infect 2001; 34:57-62. [PMID: 11321129] [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: 02/19/2023]
Abstract
In order to determine the prevalence of childhood allergic diseases, infectious diseases, and the relationship between them, 8723 children from three junior high schools in Tou-Cheng City, Taipei County, were studied using questionnaires developed according to the International Study of Asthma and Allergies in Childhood (ISAAC) criteria combined with supplementary questions about infectious diseases. Students and their parents completed the questionnaires at home. The age of the children ranged from 10 to 18 years old (14.12 +/- 0.89 years), the majority (96.03%) was aged from 13 to 15 years old. The 12-month prevalences of self-reported allergic disease symptoms were: asthma symptom 8.2%, allergic rhinitis symptom 39.6%, and atopic dermatitis symptom 5.9%. The prevalences of diagnosis of the allergic diseases were: asthma 8.7%, allergic rhinitis 24.1%, and atopic dermatitis 3.9%. The 12-month prevalences of diagnosis of infectious diseases were: pneumonia 0.6%, bronchitis 7.2%, sinusitis 7.2%, purulent conjunctivitis 2.5%, otitis media 4.3%, encephalitis or meningitis 0.4%, gastroenteritis 14.5%, acne 23.9%, purulent dermatitis 1.3%, and other infectious diseases 1.2%. Lifetime admission rates of children due to infectious diseases were: pneumonia 1%, bronchitis 1.8%, sinusitis 0.3%, purulent conjunctivitis 0.2%, otitis media 0.3%, encephalitis or meningitis 0.3%, gastroenteritis 2.1%, and other infectious diseases 0.6%. The prevalence of infectious diseases was significantly higher in children with allergic disease symptoms (defined as asthma, allergic rhinitis, or atopic dermatitis). These results demonstrated the presence of a link between allergic diseases and infectious diseases, which may have some important clinical implications.
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Affiliation(s)
- C F Chen
- Department of Pediatrics, Chia-Yi Christian Hospital, Taipei, Taiwan, ROC
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25
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Chen CY, Chang FR, Shih YC, Hsieh TJ, Chia YC, Tseng HY, Chen HC, Chen SJ, Hsu MC, Wu YC. Cytotoxic constituents of Polyalthia longifolia var. pendula. J Nat Prod 2000; 63:1475-1478. [PMID: 11087586 DOI: 10.1021/np000176e] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new halimane diterpene, 3beta,5beta, 16alpha-trihydroxyhalima-13(14)-en-15,16-olide (1), and a new oxoprotoberberine alkaloid, (-)-8-oxopolyalthiaine (2), along with 20 known compounds, were isolated from a methanolic extract of Polyalthia longifolia var. pendula. The structures of compounds 1 and 2 were established by spectroscopic analysis. Several of these compounds were evaluated for cytotoxicity toward a small panel of human cell lines.
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Affiliation(s)
- C Y Chen
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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Hsu MC, Jwo JJ. Kinetic study of the isotope exchange reactions of malonic acid and its derivatives in various acidic D2O media using1H NMR spectroscopy. Implication in the Belousov-Zhabotinsky reaction. INT J CHEM KINET 1999. [DOI: 10.1002/(sici)1097-4601(1999)31:6<455::aid-kin7>3.0.co;2-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Affiliation(s)
- M C Hsu
- Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, Taipei, Taiwan, ROC
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Hsu MC, Bai JP. Investigation into the presence of insulin-degrading enzyme in cultured type II alveolar cells and the effects of enzyme inhibitors on pulmonary bioavailability of insulin in rats. J Pharm Pharmacol 1998; 50:507-14. [PMID: 9643444 DOI: 10.1111/j.2042-7158.1998.tb06192.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [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: 11/28/2022]
Abstract
The purpose of this study was to investigate the role of insulin-degrading enzyme (IDE, EC 3.4.22.11) in insulin degradation in alveolar epithelium. The primary culture of isolated rat type-II pneumocytes was used for the in-vitro characterization of IDE. Insulin was then administered intratracheally with various inhibitors to assess the improvement in its pulmonary bioavailability. In cultured type-II pneumocytes, the cytosolic insulin-degrading activity contributed 81% of total insulin degradation, reached a maximum at pH 7.5 and had an apparent Michaelis-Menten constant (Km) of 135 nM. N-Ethylmaleimide, p-chloromercuribenzoic acid and 1,10-phenanthroline inhibited insulin-degrading activity almost completely in both crude homogenate and cytosol. An immunoprecipitation study showed that IDE contributed 74% of cytosolic insulin-degrading activity. Western blot analysis showing a single band of 110 kDa on reduced SDS (sodium dodecylsulphate) gels confirmed the presence of IDE in cultured type-II cells. When given intratracheally with insulin, inhibitors including N-ethylmaleimide, p-chloromercuribenzoic acid, and 1,10-phenanthroline significantly enhanced the absolute bioavailability of insulin and the compound's hypoglycaemic effects. These results suggest that IDE is present in alveolar epithelium and might be involved in limiting insulin absorption in the lung.
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Affiliation(s)
- M C Hsu
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota, Minneapolis 55455, USA
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Yang CM, Hsu MC, Tsao HL, Chiu CT, Ong R, Hsieh JT, Fan LW. Effect of cAMP elevating agents on carbachol-induced phosphoinositide hydrolysis and calcium mobilization in cultured canine tracheal smooth muscle cells. Cell Calcium 1996; 19:243-54. [PMID: 8732264 DOI: 10.1016/s0143-4160(96)90025-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [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: 02/01/2023]
Abstract
The effects of increases in intracellular adenosine 3',5'-cyclic monophosphate (cAMP) on carbachol-induced generation of inositol phosphates (IPs) and increases in intracellular Ca2+ ([Ca2+]i) were investigated in canine cultured tracheal smooth muscle cells (TSMCs). The cAMP elevating agents, cholera toxin (CTX) and forskolin, induced concentration- and time-dependent cAMP formation with half-maximal effects (-logEC50) at concentrations of 7.6 +/- 1.3 g/ml and 4.8 +/- 0.9 M, respectively. Forskolin caused a concentration-dependent inhibition of carbachol-induced increase in [Ca2+]i with half-maximal inhibition (-logEC50) at 5.2 +/- 0.7 M. Pretreatment of TSMCs with either CTX (10 micrograms/ml, 4 h), forskolin (10-100 microM, 30 min), or dibutyryl cAMP (1 mM, 30 min) inhibited carbachol-stimulated Ca2+ mobilization and IPs accumulation. The inhibitory effects of these agents produced both depression of the maximal response and a shift to the right of the concentration-response curve of carbachol without changing the EC50 values. After treatment with forskolin for 24 h, carbachol-induced IPs accumulation and Ca2+ mobilization were close to those of control group. SQ-22536 [9-(tetrahydro-2-furanyl)-9H-purin-6-amine, 10 microM], an inhibitor of adenylate cyclase, and HA-1004 [N-(2-guanidinoethyl)-5-isoquinolinesulfonamide hydrochloride, 50 microM], an inhibitor of cAMP-dependent protein kinase (PKA), attenuated the ability of forskolin to inhibit carbachol-induced IPs accumulation. Moreover, the inactive analogue of forskolin, 1,9-dideoxy forskolin, did not inhibit these responses evoked by carbachol, suggesting that activation of cAMP/PKA was involved in these inhibitory effects of forskolin. The KD and Bmax values of the muscarinic receptor (mAChR) for [3H]-N-methyl scopolamine binding were not significantly changed by forskolin treatment for 30 min and 24 h, suggesting that the inhibitory effect of forskolin is distal to the mAChR. The locus of this inhibition was further investigated by examining the effect of forskolin treatment on AIF4(-)-stimulated IPs accumulation in canine TSMCs. The AIF4(-)-induced response was inhibited by forskolin, supporting the notion that G protein(s) are directly activated by AIF4- and uncoupled to phospholipase C by forskolin treatment. We conclude that cAMP elevating agents inhibit carbachol-stimulated generation of IPs and Ca2+ mobilization in canine cultured TSMCs. Since generation of IPs and increases in [Ca2+]i are very early events in the activation of mAChRs, attenuation of these events by cAMP elevating agents might well contribute to the inhibitory effect of cAMP on tracheal smooth muscle formation.
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Affiliation(s)
- C M Yang
- Department of Pharmacology, Chang Gung College of Medicine and Technology, Taiwan
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Yang CM, Hsu MC, Ong R, Hsieh JT, Tsao HL, Chen YC, Luo SF. Inhibitory Effect of Phorbol Ester on Carbachol-Induced Signal Transduction in Cultured Canine Tracheal Smooth Muscle Cells. J Biomed Sci 1995; 2:283-292. [PMID: 11725065 DOI: 10.1007/bf02253389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Regulation of the increases in inositol 1,4,5-trisphosphate (IP(3)) production and intracellular Ca(2+) concentration ([Ca(2+)](i)) by activation of protein kinase C (PKC) was investigated in cultured canine tracheal smooth muscle cells (TSMCs). Stimulation of TSMCs by carbachol led to IP(3) formation and caused an initial transient peak of [Ca(2+)](i) followed by a sustained elevation in a concentration-dependent manner. Pretreatment of TSMCs with phorbol 12-myristate 13-acetate (PMA, 1 &mgr;M) for 30 min blocked the carbachol-induced IP(3) formation and Ca(2+) mobilization. Following preincubation, carbachol-induced Ca(2+) mobilization recovered within 24 h. The concentrations of PMA that gave half-maximal inhibition of carbachol-induced IP(3) formation and increase in [Ca(2+)](i) were 7 and 4 nM, respectively. Prior treatment of TSMCs with staurosporine (1 &mgr;M), a PKC inhibitor, inhibited the ability of PMA to attenuate carbachol-induced responses. Inactive phorbol ester, 4alpha-phorbol 12,13-didecanoate at 1 &mgr;M, did not inhibit these responses to carbachol. The K(d) and B(max) of the muscarinic receptor for [(3)H]N-methylscopolamine binding were not significantly changed by PMA treatment. PMA also decreased PKC activity in the cytosol of TSMCs, while increasing it transiently in the membranes within 30 min. Thereafter, the membrane-associated PKC activity decreased and persisted for at least 24 h of PMA treatment. Taken together, these results suggest that activation of PKC may inhibit phosphoinositide hydrolysis and consequently attenuate the [Ca(2+)](i) increase or inhibit both responses independently. The inhibition by PMA of carbachol-induced responses was inversely correlated with membranous PKC activity. Copyright 1995 S. Karger AG, Basel
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Affiliation(s)
- C.-M. Yang
- Cellular and Molecular Pharmacology Laboratory, Department of Pharmacology, Chang Gung College of Medicine and Technology, Tao-Yuan, Taiwan, Republic of China
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Cupelli LA, Hsu MC. The human immunodeficiency virus type 1 Tat antagonist, Ro 5-3335, predominantly inhibits transcription initiation from the viral promoter. J Virol 1995; 69:2640-3. [PMID: 7884917 PMCID: PMC188946 DOI: 10.1128/jvi.69.4.2640-2643.1995] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Tat, the transcriptional transactivator protein of the human immunodeficiency virus type 1 (HIV-1), is required for viral replication in vitro. The Tat antagonist, Ro 5-3335, and its analog, Ro 24-7429, have been shown to inhibit replication of HIV-1 and to reduce steady-state viral RNA in infected cells (M.-C. Hsu et al., Science 254:1799-1802, 1991, and M.-C. Hsu et al., Proc. Natl. Acad. Sci. USA 90:6395-6399, 1993). Analysis of HIV-1 long terminal repeat-driven reporter gene transcription in a recombinant adenovirus by nuclear run-on assay indicated that the drug predominantly inhibits Tat-dependent initiation and also exerts a measurable effect on elongation. This result may imply a common mechanism for Tat-mediated transcription initiation and elongation.
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Affiliation(s)
- L A Cupelli
- Roche Research Center, Hoffmann-La Roche, Inc., Nutley, New Jersey 07110
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32
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Connell EV, Hsu MC, Richman DD. Combinative interactions of a human immunodeficiency virus (HIV) Tat antagonist with HIV reverse transcriptase inhibitors and an HIV protease inhibitor. Antimicrob Agents Chemother 1994; 38:348-52. [PMID: 7514858 PMCID: PMC284453 DOI: 10.1128/aac.38.2.348] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Combinations of the human immunodeficiency virus (HIV) Tat protein antagonist Ro 24-7429 with either the HIV protease inhibitor Ro 31-8959 or the HIV reverse transcriptase inhibitors AZT (3'-azido-3'-deoxythymidine), ddC (2',3'-dideoxycytidine), ddI (2',3'-dideoxyinosine), and nevirapine were synergistic or additive in reducing HIV type 1 p24 antigen production in CEM cells or inhibiting HIV type 1-induced syncytium formation in HT4-6C cells.
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Affiliation(s)
- E V Connell
- Department of Virology, Hoffmann-LaRoche Inc., Nutley, New Jersey 07110
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Hsu MC, Dhingra U, Earley JV, Holly M, Keith D, Nalin CM, Richou AR, Schutt AD, Tam SY, Potash MJ. Inhibition of type 1 human immunodeficiency virus replication by a tat antagonist to which the virus remains sensitive after prolonged exposure in vitro. Proc Natl Acad Sci U S A 1993; 90:6395-9. [PMID: 8341644 PMCID: PMC46938 DOI: 10.1073/pnas.90.14.6395] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The transactivator of transcription, Tat, of human immunodeficiency virus type 1 (HIV-1) is required for viral replication. Inhibition of Tat function could have the potential to keep integrated provirus in dormancy. In the presence of Tat, Ro 24-7429, an analog of Ro 5-3335, inhibited expression of indicator genes controlled by the HIV-1 long terminal repeat promoter in transient transfection assays and in a constitutive cell line at noncytotoxic concentrations. Reduction of steady-state mRNA of the indicator gene by the compound correlated with reduction of the gene product in the constitutive cell line. Ro 24-7429 has broad activity against several strains of HIV-1 in different cell lines, peripheral blood lymphocytes, and macrophages (IC90 = 1-3 microM). Importantly, Ro 24-7429 inhibited viral replication in both acute and chronic infection in vitro, a characteristic expected of a Tat antagonist and not shared by viral reverse transcriptase inhibitors. Consistent with this, the compound reduced cell-associated viral RNA and proteins and partially restored cell-surface CD4 in chronically infected cells. After 2 years of continued weekly passage of the virus in fresh CEM cells grown in the presence of the compound at 1 or 10 microM, the virus did not develop resistance to the drug. These results indicate that the compound's action might involve a cellular factor.
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Affiliation(s)
- M C Hsu
- Department of Virology, Hoffmann-La Roche Inc., Nutley, NJ 07110
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34
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Lee TY, Yang YS, Tseng LH, Ko TM, Hsu MC, Chuang SM. Norplant-2 subdermal contraceptive system: experience in Taiwan. J Formos Med Assoc 1993; 92:446-50. [PMID: 8104598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Subdermal Norplant-2 implantation, developed for contraception based on sustained release of levonorgestrel, has already been conducted in many countries around the world. From October 1986 to November 1988, a total of 267 female volunteers were enrolled in Norplant studies at the National Taiwan University Hospital. After a follow-up of 36 months, only one of the 231 evaluable cases (0.4%) became pregnant. The continuation rate was 84.5%, 61.3%, and 52.0% at the end of 12, 24 and 36 months after insertion, respectively. Menstrual problems were the most common adverse effects and were also the main reason for discontinuation. In the 23 patients who wished to become pregnant, fertility occurred soon after removal of the Norplant implant. After insertion, serum total cholesterol and triglyceride levels significantly decreased and the hemoglobin concentrations were increased. No liver or renal toxicities were detected. The data suggest that Norplant-2 is a highly effective, safe and long-acting method of reversible contraception. It would be worthwhile to introduce this contraceptive system into Taiwan's family planning program.
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Affiliation(s)
- T Y Lee
- Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, R.O.C
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Slice LW, Codner E, Antelman D, Holly M, Wegrzynski B, Wang J, Toome V, Hsu MC, Nalin CM. Characterization of recombinant HIV-1 Tat and its interaction with TAR RNA. Biochemistry 1992; 31:12062-8. [PMID: 1457403 DOI: 10.1021/bi00163a014] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Recombinant HIV-1 Tat (Tat 1-86) has been purified from the cytoplasmic fraction of Escherichia coli without the use of protein denaturants or chaotropic agents. Chloroquine-mediated uptake of the purified protein into cells resulted in transactivation of the HIV LTR promoter. Tat retains 1.64 mol of Zn2+/mol of protein by atomic absorption spectroscopy. Circular dichroism measurements indicated that the structure of recombinant Tat contains 15-20% alpha-helix. Filter binding assays showed that Tat binds to a 63-nucleotide target TAR RNA with a dissociation constant (Kd) of 10 nM at 25 degrees C, 0.05 M ionic strength, pH 7.5, in a 1:1 Tat-TAR RNA stoichiometry. Nonelectrostatic interactions provide the principal source of free energy of association. While the pH optimum occurs over a wide H+ concentration, the salt dependence of Kd indicates formation of a single ion pair. UV-induced protein-RNA cross-linking produced a labeled Tat-TAR RNA adduct, indicating that direct contact occurred between the Tat protein and TAR RNA.
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Affiliation(s)
- L W Slice
- Department of Virology, Roche Research Center, Hoffmann-La Roche Inc., Nutley, New Jersey 07110
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Shahabuddin M, Volsky B, Hsu MC, Volsky DJ. Restoration of cell surface CD4 expression in human immunodeficiency virus type 1-infected cells by treatment with a Tat antagonist. J Virol 1992; 66:6802-5. [PMID: 1404619 PMCID: PMC240182 DOI: 10.1128/jvi.66.11.6802-6805.1992] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Productive infection of T lymphocytes with human immunodeficiency virus type 1 (HIV-1) is accompanied by a diminution of surface CD4 receptors. Treatment of chronically HIV-1-infected CD4-negative T cells in vitro with the Tat antagonist Ro 5-3335 resulted in a drug dose-dependent decrease in virus protein production and a reciprocal increase in surface CD4 display. The drug-treated cells remained viable, showed significantly reduced levels of the full-length and spliced HIV-1 mRNAs as detected by Northern (RNA) blot hybridization, and maintained integrated HIV-1 DNA. In immunoprecipitation studies with drug-treated cells, the levels of free 55-kDa CD4 protein increased and gp160 complexed with CD4 decreased in amount. These results show for the first time that certain cytopathogenic effects of chronic HIV-1 infection can be reversed by suppressing virus expression.
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Affiliation(s)
- M Shahabuddin
- Molecular Virology Laboratory, St. Luke's/Roosevelt Hospital Center, New York, New York
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Abstract
A reversed-phase column liquid chromatographic method was developed for the assay of cefadroxil in bulk drugs and pharmaceutical preparations. An equation was derived showing a linear relationship between peak-area ratios of cefadroxil to dimethylphthalate (internal standard) and the cefadroxil concentration over a range of 0.02-0.8 mg/ml (r = 0.9999). Standard addition recoveries were generally greater than 97.7%. The coefficients of variation in the within-day assay were between 0.36 and 0.65, and in the between-day assay was 0.71%. The column liquid chromatographic assay results were compared with those obtained from a microbiological assay, which indicated that the proposed method is a suitable substitute for the microbiological method for potency assays and stability studies of cefadroxil preparations.
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Affiliation(s)
- M C Hsu
- National Laboratories of Foods and Drugs, Department of Health, Taipei, Taiwan
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Hsu MC, Hsu PW. High-performance liquid chromatographic method for potency determination of amoxicillin in commercial preparations and for stability studies. Antimicrob Agents Chemother 1992; 36:1276-9. [PMID: 1416827 PMCID: PMC190331 DOI: 10.1128/aac.36.6.1276] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [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: 12/26/2022] Open
Abstract
A reversed-phase column liquid chromatographic method was developed for the assay of amoxicillin and its preparations. The linear calibration range was 0.2 to 2.0 mg/ml (r = 0.9998), and recoveries were generally greater than 99%. The high-performance liquid chromatographic assay results were compared with those obtained from a microbiological assay of bulk drug substance and capsule, injection, and granule formulations containing amoxicillin and degraded amoxicillin. At the 99% confidence level, no significant intermethod differences were noted for the paired results. Commercial formulations were also analyzed, and the results obtained by the proposed method closely agreed with those found by the microbiological method. The results indicated that the proposed method is a suitable substitute for the microbiological method for assays and stability studies of amoxicillin preparations.
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Affiliation(s)
- M C Hsu
- Department of Health, Executive Yuan, National Laboratories of Foods and Drugs, Taipei, Taiwan, Republic of China
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Hsu MC, Schutt AD, Holly M, Slice LW, Sherman MI, Richman DD, Potash MJ, Volsky DJ. Discovery and characterization of an HIV-1 Tat antagonist. Biochem Soc Trans 1992; 20:525-31. [PMID: 1397654 DOI: 10.1042/bst0200525] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Ro 5-3335, 7-chloro-5-(2-pyrryl)-3H-1,4-benzo-diazepin-2-(H)-one, has been shown to inhibit gene expression controlled by the human immunodeficiency virus-1 (HIV-1) LTR promoter. The inhibition was specific for the viral transcriptional transactivator Tat. The compound did not inhibit the basal activity of the HIV-1 LTR or the activity of promoters not responsive to Tat. Consistent with its mode of action, Ro 5-3335 inhibited HIV-1 replication (IC50 = 0.1-1 microM) by reducing viral RNA synthesis in acutely, as well as chronically, infected cells in vitro. The compound was active against HIV-1 and HIV-2, and AZT-resistant clinical isolates.
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Affiliation(s)
- M C Hsu
- Department of Virology, Hoffmann-La Roche Inc., Nutley, NJ 07110
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40
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Wang FN, Hsu MC, Cheng CM, Su TP, Yeh KA, Lai WH, Hsiung CH, Karow WG, Tsai HD. Intrauterine devices Wang S.S Cu 380 as compared to ML Cu 375, Nova T, T Cu 300, 7 Cu 200, Lippes Loop and Ohta Ring: clinical / physiopathological parameters. Adv Contracept Deliv Syst 1992; 8:267-76. [PMID: 12285733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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41
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Hsu MC, Schutt AD, Holly M, Slice LW, Sherman MI, Richman DD, Potash MJ, Volsky DJ. Inhibition of HIV replication in acute and chronic infections in vitro by a Tat antagonist. Science 1991; 254:1799-802. [PMID: 1763331 DOI: 10.1126/science.1763331] [Citation(s) in RCA: 193] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The human immunodeficiency virus-1 (HIV-1) trans-activator Tat is an attractive target for the development of antiviral drugs because inhibition of Tat would arrest the virus at an early stage. The drug Ro 5-3335 [7-chloro-5-(2-pyrryl)-3H-1,4-benzodiazepine-2(H)-one], inhibited gene expression by HIV-1 at the level of transcriptional trans-activation by Tat. The compound did not inhibit the basal activity of the promoter. Both Tat and its target sequence TAR were required for the observed inhibitory activity. Ro 5-3335 reduced the amount of cell-associated viral RNA and antigen in acutely, as well as in chronically infected cells in vitro (median inhibition concentration 0.1 to 1 micromolar). Effective inhibition of viral replication was also observed 24 hours after cells were transfected with infectious recombinant HIV-1 DNA. The compound was active against both HIV-1 and HIV-2 and against 3'-azido-3'-deoxythymidine (AZT)-resistant clinical isolates.
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Affiliation(s)
- M C Hsu
- Department of Virology, Hoffmann-La Roche, Nutley, NJ 07110
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42
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Hsu MC, Cheng MC. High-performance liquid chromatographic method for the determination of cloxacillin in commercial preparations and for stability studies. J Chromatogr 1991; 549:410-5. [PMID: 1770084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- M C Hsu
- National Laboratories of Foods and Drugs, Department of Health, Nankang, Taipei, Taiwan
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43
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Nalin CM, Purcell RD, Antelman D, Mueller D, Tomchak L, Wegrzynski B, McCarney E, Toome V, Kramer R, Hsu MC. Purification and characterization of recombinant Rev protein of human immunodeficiency virus type 1. Proc Natl Acad Sci U S A 1990; 87:7593-7. [PMID: 2217189 PMCID: PMC54794 DOI: 10.1073/pnas.87.19.7593] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [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: 12/30/2022] Open
Abstract
Recombinant Rev protein of human immunodeficiency virus type 1 has been expressed in Escherichia coli and purified by ion-exchange and gel-filtration chromatography. Specific binding of the purified protein to the Rev-responsive element of the viral RNA is demonstrated. Physical characterization of the purified protein by circular dichroism and intrinsic fluorescence spectroscopy indicate that the protein preparation is suitable for structural analysis. Circular dichroism measurements show that the protein is approximately 40-45% alpha-helix. Tryptophan fluorescence measurements suggest that the single tryptophan residue is located near the surface of the protein. Gel-filtration chromatography of the protein indicates that it has an apparent molecular mass of 33,000 daltons. This suggests that the protein in solution forms a stable tetramer consisting of monomers having molecular mass of 13,000 daltons.
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Affiliation(s)
- C M Nalin
- Department of Protein Biochemistry, Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110
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Hwang JL, Hsu MC, Yang YS, Lee TY. Hypertensive disorders in pregnancy: analysis of 110 cases. Taiwan Yi Xue Hui Za Zhi 1989; 88:572-8. [PMID: 2794958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
One hundred and ten cases of hypertensive disorders in pregnancy were analyzed retrospectively. There were 16 cases of gestational hypertension, 36 cases of mild preeclampsia, 43 cases of severe preeclampsia, 6 cases of eclampsia, and 9 cases of chronic hypertension with superimposed severe preeclampsia. The principle of management was conservative in order to prolong pregnancy for patients remote from term. Corticosteroids were used to accelerate fetal lung maturity for patients with gestations of less than 36 weeks and magnesium sulfate was administered to prevent seizures. Fetal heart rate monitoring was done routinely and doppler blood flow velocity time wave form study of uterine and umbilical arteries was also performed in the latter part of the study. The cesarean section rate in gestational hypertension and mild preeclampsia was comparable to the general obstetric population in our institute (26.9% vs. 21.2%), but the rate of severe forms of the disease including severe preeclampsia, eclampsia, and chronic hypertension with superimposed severe preeclampsia was as high as 77.6%. Fetal distress was the main indication of section. There were 2 cases (6.9%) of mild respiratory distress syndrome, and all recovered uneventfully. The patients with severe forms of the disease had a higher incidence of small infants for gestational age (72%) and delivery at less than 36 weeks' gestation (48.2%). The corrected perinatal mortality rate was 5.4%. No maternal death was encountered. It was concluded that pregnancy could be prolonged in the interest of fetal lung maturity under meticulous maternal-fetal monitoring without endangering the mother.
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Hsu MC, Shih JC. Photoaffinity labeling of human placental monoamine oxidase-A by 4-fluoro-3-nitrophenyl azide. Mol Pharmacol 1988; 33:237-41. [PMID: 3340083] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Our previous work has shown that low concentrations of 4-fluoro-3-nitrophenyl azide (FNPA) (0.01-1 microM) photodependently inhibited only the type B monoamine oxidase in rat brain [Biochem. Pharmacol. 34:781-785 (1985)]. Evidence is presented in this paper indicating that higher concentrations of FNPA (15 microM) photodependently inhibit type A monoamine oxidase (MAO-A) from human placenta. FNPA acted as a competitive inhibitor for human placental MAO-A in the dark (Ki = 10 microM) when [14C]serotonin was used as the substrate. The inhibition of MAO-A activity by FNPA was concentration dependent and also irradiation time dependent. The specificity of the photodependent incorporation of FNPA to MAO-A was shown by the protective effect of serotonin during the irradiation. The kinetic analysis showed that the Vmax was decreased whereas the Km was not changed after FNPA was photolyzed with MAO-A. Furthermore, there was no recovery of MAO-A activity upon washing of the photolyzed FNPA-enzyme mixture. These results suggest that FNPA may be covalently bound to the substrate-binding site. Thus, under the present experimental conditions, FNPA is a suitable photoaffinity labeling probe for human placental MAO-A. This is the first photoaffinity label for MAO-A, which may be useful for characterizing the substrate-binding site of this enzyme.
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Affiliation(s)
- M C Hsu
- Division of Biological Sciences, School of Pharmacy, University of Southern California, Los Angeles 90033
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Abstract
The effects of moderate physical exercise (performed on a bicycle ergometer to 70-75% of maximum oxygen consumption) without fluid replenishment on urinary chemistries and crystallization of kidney stone-forming substances were compared to those of rest in six normal subjects. Moderate physical exercise significantly decreased urinary pH [from 6.35 +/- 0.32 (+/-SD) to 5.79 +/- 0.33; P less than 0.05] and citrate [from 121.1 +/- 63.5 to 88.2 +/- 44.4 mg/6-h period from initiation of physical exercise; P less than 0.05 (630 +/- 331 to 459 +/- 231 mumol/6 h)], owing to induced metabolic acidosis. The total renal excretion of stone-forming constituents decreased [for example, calcium from 31.2 +/- 15.8 to 21.4 +/- 6.5 mg/6 h (0.8 +/- 0.4 to 0.5 +/- 0.2 mmol/6 h), phosphorus from 155 +/- 42 to 127 +/- 27 mg/6 h (5.01 +/- 1.4 to 4.1 +/- 0.9 mmol/6 h), and uric acid from 172 +/- 60 to 117 +/- 13 mg/6 h (1.0 +/- 0.4 to 0.7 +/- 0.1 mmol/6 h), each P less than 0.05], probably due to extracellular volume contraction (from sweating) and enhanced renal tubular reabsorption. However, the urinary concentration of stone-forming constituents significantly increased during and after moderate exercise because of the fall in urinary volume from 847 +/- 312 to 290 +/- 36 ml/6 h (P less than 0.01). Thus, urinary calcium oxalate saturation increased significantly from 2.62- to 6.68-fold saturation (P less than 0.01). The urinary undissociated uric acid concentration significantly rose [from 31.6 +/- 24.8 to 125.7 +/- 60.3 mg/L (0.19 +/- 0.15 to 0.76 +/- 0.36 mmol/L; P less than 0.01)], due to higher total uric acid concentration and reduced urinary pH. The saturation of calcium phosphate (brushite) did not change significantly, because the rise in urinary calcium concentration was compensated for by reduced phosphate dissociation (from lower urinary pH). The propensity for spontaneous precipitation of calcium oxalate was greater after exercise, as less soluble oxalate was required to elicit nucleation of calcium oxalate [58.0 +/- 21.2 to 49.0 +/- 16.4 mg/L (644 +/- 236 to 544 +/- 182 mumol/L); P less than 0.05]. The results suggest that moderate physical exercise, without increased fluid intake to compensate for excessive sweating, may cause the crystallization of uric acid and calcium oxalate in urine and may enhance the risk of the formation of renal stones composed of these salts.
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Affiliation(s)
- K Sakhaee
- Section on Mineral Metabolism, Southwestern Medical School of the University of Texas Health Science Center, Dallas 75235
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Abstract
An improved formulation of calcium citrate with higher aqueous solubility and bioavailability was sought. Mixtures of calcium hydroxide and citric acid, with a calcium to citrate molar ratio ranging from 0.67-1.5, dissolved rapidly in water, creating a metastably supersaturated solution. The presence of an excess of citrate in the mixture delayed the precipitation of calcium citrate and kept calcium in solution longer. Thus, the mixture with a calcium to citrate molar ratio of 1.25, containing 500 mg elemental calcium, dissolved in 300 mL water within 2 min and could be kept in solution for 1 h at a wide pH range between 2 and 7. Intestinal calcium absorption, measured from the increment in urinary calcium during the second 2 h following an oral calcium load (500 mg) in 15 normal subjects was significantly higher from the mixtures (calcium to citrate molar ratios of 1.5 and 1.25) than from tricalcium dicitrate. The fractional calcium absorption, obtained from fecal recovery of radiocalcium after oral administration of 500 mg calcium prelabeled with 47Ca in 11 normal subjects, was also higher for the mixture with a calcium to citrate molar ratio of 1.25. The most efficient calcium absorption was obtained with the mixture of calcium hydroxide and citric acid with a calcium to citrate molar ratio of 1.25. The increment in urinary calcium after an oral load with this mixture was 62.4% greater than that obtained with tricalcium dicitrate [0.138 +/- 0.056 (+/- SD) vs. 0.085 +/- 0.086 mg/dL glomerular filtrate; P less than 0.05]. The fractional calcium absorption was 88.4% higher (0.324 +/- 0.107 vs. 0.172 +/- 0.061; P less than 0.05). This mixture provided the highest concentration of ionic calcium, indicating that calcium (rather than calcium-citrate complex) is the fraction absorbed from the intestinal tract. This study, therefore, suggests that a liquid calcium preparation formulated from the mixture of calcium hydroxide and citric acid is more effective than a solid preparation of tricalcium dicitrate in providing soluble and bioavailable calcium.
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Affiliation(s)
- C Y Pak
- Department of Internal Medicine, Southwestern Medical School, University of Texas Health Science Center, Dallas 75235
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Yang YS, Ko TM, Lien YR, Hsu MC, Chang YK, Lee TY. Sequential use of clomiphene citrate and human menopausal gonadotropin for induction of ovulation. Taiwan Yi Xue Hui Za Zhi 1987; 86:1049-54. [PMID: 3125303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Abstract
This study determined the extent and impact of tobramycin pharmacokinetic variability in cystic fibrosis patients. Twenty patients were hospitalized twice and the tobramycin half-life, volume of distribution and clearance were determined during Weeks 1 and 2 of both admissions. A difference (P less than 0.05) existed between Weeks 1 and 2 of each admission, but not between admissions, for the clearance and half-life. No difference existed between weeks or admissions for the volume of distribution. No significant correlations existed between weeks within an admission for the half-life and clearance. There was a significant correlation for the volume of distribution between Weeks 1 and 2 of the second admission but not for the first admission. The percents of coefficient of variation and ranges were large. With dosing regimens derived from previously determined factors, "within admission" predicted peaks and troughs would result in 60 and 35% of patients outside the therapeutic range for Admissions 1 and 2, respectively. "Between admission" predictions would result in 65 and 75% of patients outside the therapeutic range. We conclude that considerable variability exists and recommend weekly determinations of serum concentrations and dosing adjustments.
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Affiliation(s)
- P J Munzenberger
- Department of Pharmacy Practice and Pharmacy, Wayne State University, Children's Hospital of Michigan, Detroit 48202
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Abstract
A preservation technique for urine specimens before determination of stone risk factors was evaluated. The purpose of these experiments was to prove the effectiveness of the preservatives used to prevent changes in the concentrations of those constituents measured. Measured concentrations in fresh specimens were compared with those in the same specimens after storage with the preservatives. Refrigeration at 4 degrees C up to five days was appropriate in a laboratory setting, as no significant changes in urinary concentrations occurred. Refrigeration, however, did not offer a convenient method for shipping. Chemical preservation was found to be an effective alternative to refrigeration. Thymol prevented changes in concentration of pH, citrate, uric acid, sulfate, sodium, potassium, and cyclic AMP, while a mixture of hydrochloric (HCl) acid and boric acid prevented changes in calcium, magnesium, phosphorus, oxalate, ammonium, and creatinine. Thus, the addition of thymol or HCl/boric acid to urine specimens will prevent significant changes in the concentrations of stone risk factors.
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Affiliation(s)
- M J Nicar
- Center on Mineral Metabolism and Clinical Research, Southwestern Medical School of the University of Texas Health Science Center at Dallas, TX 75235, USA
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