101
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Citrin D, Horton J, White A, Hudak K, Scroggins B, Chung E. Bone Marrow Mesenchymal Stromal Cell Infusion Improves Radiation-induced Cutaneous Fibrosis in a Murine Model. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.175] [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: 12/01/2022]
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102
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Chung E, Diffee GM. Moderate intensity, but not high intensity, treadmill exercise training alters power output properties in myocardium from aged rats. J Gerontol A Biol Sci Med Sci 2012; 67:1178-87. [PMID: 22843668 PMCID: PMC3636676 DOI: 10.1093/gerona/gls146] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 05/15/2012] [Indexed: 11/14/2022] Open
Abstract
Aging is characterized by a progressive decline in cardiac function, but endurance exercise training has been shown to retard a number of deleterious effects of aging. However, underlying mechanisms by which exercise training improves age-related decrements in myocardial contractile function are not well understood. The purpose of this study was to determine the effects of exercise training on power output properties in permeablized (skinned) myocytes of old rats. Thirty-month-old rats were divided into sedentary control (C) and groups undergoing 11 weeks of treadmill exercise training at moderate intensity (MI) and at high intensity (HI). Peak power output normalized to maximal force was significantly increased in MI but not in HI compared to C with significant increases in atrial myosin light chain 1 in ventricle. These results suggest that MI exercise training is beneficial as a significant increase was seen in the ability of the myocardium to do work, but this effect was not seen with HI training.
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Affiliation(s)
- Eunhee Chung
- Balke Biodynamics Laboratory, Department of Kinesiology,University of Wisconsin-Madison, Madison, Wisconsin 53706-1121, USA
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103
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Kim K, Chung E, Kim CJ, Lee S. Swimming exercise during pregnancy alleviates pregnancy-associated long-term memory impairment. Physiol Behav 2012; 107:82-6. [DOI: 10.1016/j.physbeh.2012.06.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 05/31/2012] [Accepted: 06/05/2012] [Indexed: 12/13/2022]
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104
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Chung E, Conneely E, Ruo R, Foley M, Seuntjens J. Poster - Thur Eve - 24: Clinical application of the new dosimetry formalism for composite nonstandard beams. Med Phys 2012; 39:4629. [DOI: 10.1118/1.4740132] [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: 11/07/2022] Open
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105
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Chung E, Davis S, Seuntjens J. TU-A-BRB-09: Ion Recombination in a Liquid-Filled Ionization Chamber in High-Energy Photon Beams. Med Phys 2012. [DOI: 10.1118/1.4735866] [Citation(s) in RCA: 1] [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: 11/07/2022] Open
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106
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Chung E, Conneely E, Ruo R, Foley M, Seuntjens J. TH-C-BRB-10: Clinical Implication of the New Dosimetry Formalism in IMRT Quality Assurance. Med Phys 2012. [DOI: 10.1118/1.4736313] [Citation(s) in RCA: 1] [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: 11/07/2022] Open
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107
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Abstract
The sarcomeric myosin gene, Myh7b, encodes an intronic microRNA, miR-499, which regulates cardiac and skeletal muscle biology, yet little is known about its transcriptional regulation. To identify the transcription factors involved in regulating Myh7b/miR-499 gene expression, we have mapped the transcriptional start sites and identified an upstream 6.2 kb region of the mouse Myh7b gene whose activity mimics the expression pattern of the endogenous Myh7b gene both in vitro and in vivo. Through promoter deletion analysis, we have mapped a distal E-box element and a proximal Ikaros site that are essential for Myh7b promoter activity in muscle cells. We show that the myogenic regulatory factors, MyoD, Myf5 and Myogenin, bind to the E-box, while a lymphoid transcription factor, Ikaros 4 (Eos), binds to the Ikaros motif. Further, we show that through physical interaction, MyoD and Eos form an active transcriptional complex on the chromatin to regulate the expression of the endogenous Myh7b/miR-499 gene in muscle cells. We also provide the first evidence that Eos can regulate expression of additional myosin genes (Myosin 1 and β-Myosin) via the miR-499/Sox6 pathway. Therefore, our results indicate a novel role for Eos in the regulation of the myofiber gene program.
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Affiliation(s)
- Fan Yeung
- Department of Molecular, Cellular, and Developmental Biology and Biofrontiers Institute, University of Colorado, Boulder, Colorado 80309, USA
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108
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La B, Oh D, Lee Y, Shin S, Lee C, Chung E, Yeo J. Association of bovine fatty acid composition with novel missense nucleotide polymorphism in thethyroid hormone-responsive(THRSP) gene. Anim Genet 2012; 44:118. [DOI: 10.1111/j.1365-2052.2012.02372.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/28/2012] [Indexed: 11/28/2022]
Affiliation(s)
- B. La
- School of Biotechnology; Yeungnam University; Gyeongsan; Gyeongbuk; 712-749; Korea
| | - D. Oh
- School of Biotechnology; Yeungnam University; Gyeongsan; Gyeongbuk; 712-749; Korea
| | - Y. Lee
- Institute of Charmpoom Hanwoo; Gyeongsan; Gyeongbuk; 712-210; Korea
| | - S. Shin
- Division of Animal Science and Resources; Sangji University; Wonju; Gangwondo; 220-702; Korea
| | - C. Lee
- School of Systems Biomedical Science; Soongsil University; Seoul; 156-743; Korea
| | - E. Chung
- Division of Animal Science and Resources; Sangji University; Wonju; Gangwondo; 220-702; Korea
| | - J. Yeo
- School of Biotechnology; Yeungnam University; Gyeongsan; Gyeongbuk; 712-749; Korea
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109
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Morin J, Béliveau-Nadeau D, Chung E, Seuntjens J, Archambault L, Beddar S, Beaulieu L. OC-0516 A SUB-MILLIMETER PLASTIC SCINTILLATION DETECTOR FOR SMALL FIELD MEASUREMENTS DELIVERED BY A CYBERKNIFE UNIT. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70855-1] [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: 10/28/2022]
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110
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Abstract
Although the signaling pathways underlying exercise-induced cardiac adaptation have been extensively studied, little is known about the molecular mechanisms that result in the response of the heart to pregnancy. The objective of this study was to define the morphological, functional, and gene expression patterns that define the hearts of pregnant mice, and to identify the signaling pathways that mediate this response. Mice were divided into three groups: nonpregnant diestrus control, midpregnancy, and late pregnancy. Both time points of pregnancy were associated with significant cardiac hypertrophy. The prosurvival signaling cascades of Akt and ERK1/2 were activated in the hearts of pregnant mice, while the stress kinase, p38, was decreased. Given the activation of Akt in pregnancy and its known role in cardiac hypertrophy, the hypertrophic response to pregnancy was tested in mice expressing a cardiac-specific activated (myristoylated) form of Akt (myrAkt) or a cardiac-specific constitutively active (antipathologic hypertrophic) form of its downstream target, glycogen synthase kinase 3β (caGSK3β). The pregnancy-induced hypertrophic responses of hearts from these mice were significantly attenuated. Finally, we tested whether pregnancy-associated sex hormones could induce hypertrophy and alter signaling pathways in isolated neonatal rat ventricular myocytes (NRVMs). In fact, progesterone, but not estradiol treatment increased NRVM cell size via phosphorylation of ERK1/2. Inhibition of MEK1 effectively blocked progesterone-induced cellular hypertrophy. Taken together, our study demonstrates that pregnancy-induced cardiac hypertrophy is mediated by activation of Akt and ERK1/2 pathways.
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MESH Headings
- Adaptation, Physiological
- Animals
- Cardiomegaly/diagnostic imaging
- Cardiomegaly/enzymology
- Cardiomegaly/genetics
- Cardiomegaly/pathology
- Cells, Cultured
- Enzyme Activation
- Estradiol/blood
- Estradiol/pharmacology
- Female
- Gestational Age
- Glycogen Synthase Kinase 3/genetics
- Glycogen Synthase Kinase 3/metabolism
- Glycogen Synthase Kinase 3 beta
- MAP Kinase Signaling System/drug effects
- MAP Kinase Signaling System/genetics
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3/metabolism
- Mitogen-Activated Protein Kinases/genetics
- Mitogen-Activated Protein Kinases/metabolism
- Myocytes, Cardiac/drug effects
- Myocytes, Cardiac/enzymology
- Myocytes, Cardiac/pathology
- Phosphorylation
- Pregnancy
- Pregnancy Complications, Cardiovascular/diagnostic imaging
- Pregnancy Complications, Cardiovascular/enzymology
- Pregnancy Complications, Cardiovascular/genetics
- Pregnancy Complications, Cardiovascular/pathology
- Progesterone/blood
- Progesterone/pharmacology
- Proto-Oncogene Proteins c-akt/genetics
- Proto-Oncogene Proteins c-akt/metabolism
- Rats
- Ribosomal Protein S6 Kinases, 70-kDa/metabolism
- TOR Serine-Threonine Kinases/metabolism
- Time Factors
- Ultrasonography
- p38 Mitogen-Activated Protein Kinases/metabolism
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Affiliation(s)
- Eunhee Chung
- Department of Molecular, Cellular, and Developmental Biology and Biofrontiers Institute, University of Colorado, Boulder, Colorado 80309-0347, USA
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111
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Oh D, Lee Y, Lee C, Chung E, Yeo J. Association of bovine fatty acid composition with missense nucleotide polymorphism in exon7 of peroxisome proliferator-activated receptor gamma gene. Anim Genet 2012; 43:474. [PMID: 22497292 DOI: 10.1111/j.1365-2052.2011.02288.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D Oh
- School of Biotechnology, Yeungnam University, Gyeongsan, Gyeongbuk, South Korea
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112
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Zhang Y, Sayre CL, Chung E, Ohgami Y, Davies NM, Quock RM. Nitrous oxide (N
2
O) increases brain L‐arginine in production of its antinociceptive effect in mice. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.662.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yao Zhang
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | - Casey L. Sayre
- Faculty of PharmacyUniversity of ManitobaWinnipegMBCanada
| | - Eunhee Chung
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | - Yusuke Ohgami
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | - Neal M. Davies
- Faculty of PharmacyUniversity of ManitobaWinnipegMBCanada
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113
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Chung E, Erickson M, Torres V, Haas G, Magalski A, Adamson P, Costanzo M, Murillo J. 459 Monitoring of Respiratory Rate Derived from an Implantable Right Ventricular Pressure Sensor in Patients with Heart Failure. J Heart Lung Transplant 2012. [DOI: 10.1016/j.healun.2012.01.470] [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: 10/28/2022] Open
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114
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Chung E, Van CT, Wilson I, Cartmill RA. Penile prosthesis implantation for the treatment for male erectile dysfunction: clinical outcomes and lessons learnt after 955 procedures. World J Urol 2012; 31:591-5. [DOI: 10.1007/s00345-012-0859-4] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Accepted: 03/10/2012] [Indexed: 12/01/2022] Open
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115
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Lee I, Chung E, Kweon H, Yiacoumi S, Tsouris C. Scanning surface potential microscopy of spore adhesion on surfaces. Colloids Surf B Biointerfaces 2011; 92:271-6. [PMID: 22196463 DOI: 10.1016/j.colsurfb.2011.11.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 10/05/2011] [Accepted: 11/30/2011] [Indexed: 11/30/2022]
Abstract
The adhesion of spores of Bacillus anthracis - the cause of anthrax and a likely biological threat - to solid surfaces is an important consideration in cleanup after an accidental or deliberate release. However, because of safety concerns, directly studying B. anthracis spores with advanced instrumentation is problematic. As a first step, we are examining the electrostatic potential of Bacillus thuringiensis (Bt), which is a closely related species that is often used as a simulant to study B. anthracis. Scanning surface potential microscopy (SSPM), also known as Kelvin probe force microscopy (KPFM), was used to investigate the influence of relative humidity (RH) on the surface electrostatic potential of Bt that had adhered to silica, mica, or gold substrates. AFM/SSPM side-by-side images were obtained separately in air, at various values of RH, after an aqueous droplet with spores was applied on each surface and allowed to dry before measurements. In the SSPM images, a negative potential on the surface of the spores was observed compared with that of the substrates. The surface potential decreased as the humidity increased. Spores were unable to adhere to a surface with an extremely negative potential, such as mica.
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Affiliation(s)
- I Lee
- Department of Electrical Engineering & Computer Science, University of Tennessee, Knoxville, TN 37996, United States.
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116
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Chung E, Corbett J, Moran J, Griffith K, Marsh R, Feng M, Jagsi R, Kessler M, Ficaro E, Pierce L. No Dose Response Relationship for Heart Disease at Low Doses. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.129] [Citation(s) in RCA: 1] [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: 11/26/2022]
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117
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Abstract
Aging is generally associated with a decline in several indices of cardiac function. The cellular mechanisms for this decline are not completely understood. The ability of the myocardium to perform external work (power output) is a critical aspect of ventricular function. The purpose of this study was to determine the effect of aging on loaded shortening and power output properties. We measured force-velocity properties in permeabilized (skinned) myocytes from the hearts of 9-, 24-, and 33-month-old male Fisher 344 × Brown Norway F1 hybrid rats (F344BN) during loaded contractions using a force-clamp technique. Power output was calculated by multiplying force and shortening velocity values. We found that peak power output normalized to maximal force was significantly decreased by 18% and 31% in myocytes from 24- and 33-month-old group, respectively, compared with 9-month group (p < .05). These results suggest that aging is associated with a significant decrease in the ability of the myocardium to do work.
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Affiliation(s)
- Eunhee Chung
- Balke, Biodynamics Laboratory, Department of Kinesiology, University of Wisconsin--Madison, Madison, WI 53706-1121, USA
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118
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Dittus P, De Rosa C, Jeffries R, Afifi A, Cumberland W, Loosier P, Ethier K, Chung E, Martinez E, Kerndt P. O2-S2.01 The project connect health systems intervention: STD screening and HIV testing outcomes for female adolescents. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050109.73] [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: 11/03/2022]
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119
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Dittus P, De Rosa C, Jeffries R, Afifi A, Cumberland W, Ethier K, Chung E, Martinez E, Loya R, Kerndt P. O5-S1.01 Employing school nurses as a healthcare point of contact for male high school students: a school-based intervention to prevent STD, HIV, and teen pregnancy. Sex Transm Infect 2011. [DOI: 10.1136/sextrans-2011-050109.151] [Citation(s) in RCA: 1] [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: 11/03/2022] Open
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120
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Chung E, Soisson E, Seuntjens J. SU-E-T-420: Sensitivity of the Plan-Class Specific Correction Factor to the Dose Distribution in Reference Dosimetry of Nonstandard Fields. Med Phys 2011. [DOI: 10.1118/1.3612374] [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: 11/07/2022] Open
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121
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Chung E, Soisson E, Seuntjens J. 104 oral SENSITIVITY OF THE CORRECTION FACTOR FOR USE IN REFERENCE DOSIMETRY OF NONSTANDARD BEAMS TO DOSE HOMOGENEITY. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)70227-4] [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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122
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Lemon DD, Horn TR, Cavasin MA, Jeong MY, Haubold KW, Long CS, Irwin DC, McCune SA, Chung E, Leinwand LA, McKinsey TA. Cardiac HDAC6 catalytic activity is induced in response to chronic hypertension. J Mol Cell Cardiol 2011; 51:41-50. [PMID: 21539845 DOI: 10.1016/j.yjmcc.2011.04.005] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Revised: 04/12/2011] [Accepted: 04/14/2011] [Indexed: 02/07/2023]
Abstract
Small molecule histone deacetylase (HDAC) inhibitors block adverse cardiac remodeling in animal models of heart failure. The efficacious compounds target class I, class IIb and, to a lesser extent, class IIa HDACs. It is hypothesized that a selective inhibitor of a specific HDAC class (or an isoform within that class) will provide a favorable therapeutic window for the treatment of heart failure, although the optimal selectivity profile for such a compound remains unknown. Genetic studies have suggested that class I HDACs promote pathological cardiac remodeling, while class IIa HDACs are protective. In contrast, nothing is known about the function or regulation of class IIb HDACs in the heart. We developed assays to quantify catalytic activity of distinct HDAC classes in left and right ventricular cardiac tissue from animal models of hypertensive heart disease. Class I and IIa HDAC activity was elevated in some but not all diseased tissues. In contrast, catalytic activity of the class IIb HDAC, HDAC6, was consistently increased in stressed myocardium, but not in a model of physiologic hypertrophy. HDAC6 catalytic activity was also induced by diverse extracellular stimuli in cultured cardiac myocytes and fibroblasts. These findings suggest an unforeseen role for HDAC6 in the heart, and highlight the need for pre-clinical evaluation of HDAC6-selective inhibitors to determine whether this HDAC isoform is pathological or protective in the setting of cardiovascular disease.
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Affiliation(s)
- Douglas D Lemon
- Department of Medicine, Division of Cardiology, University of Colorado Denver, Aurora, CO, USA
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123
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Chung E, Luckey SW, Leinwand LA. Signaling pathways differ in pregnancy and exercise‐induced cardiac hypertrophy. FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.1059.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eunhee Chung
- Molecular, Cellular, and Developmental BiologyUniversity of ColoradoBoulderBoulderCO
| | | | - Leslie A. Leinwand
- Molecular, Cellular, and Developmental BiologyUniversity of ColoradoBoulderBoulderCO
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124
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Yang H, Kim J, Chung E. Effectiveness of Combination of Losartan Potassium and Doxycycline versus Single-Drug Treatments in the Secondary Prevention of Thoracic Aortic Aneurysm in Marfan Syndrome. J Vasc Surg 2011. [DOI: 10.1016/j.jvs.2010.12.017] [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: 10/18/2022]
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125
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Ohgami Y, Chung E, Quock RM. Nitrous oxide-induced NO-dependent neuronal release of β-endorphin from the rat arcuate nucleus and periaqueductal gray. Brain Res 2010; 1366:38-43. [PMID: 20937263 DOI: 10.1016/j.brainres.2010.10.010] [Citation(s) in RCA: 15] [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] [Received: 08/14/2010] [Revised: 09/27/2010] [Accepted: 10/02/2010] [Indexed: 11/15/2022]
Abstract
Nitrous oxide (N(2)O)-induced antinociception is thought to result from nitric oxide (NO)-dependent neuronal release of endogenous opioid peptides in the central nervous system. The present study employed microdialysis to determine whether exposure to N(2)O stimulates proopiomelanocortin (POMC) neurons to release β-endorphin in the arcuate nucleus (ARC) of the hypothalamus and the periaqueductal gray (PAG) of the midbrain. Male Sprague-Dawley rats were stereotaxically implanted with microdialysis probes in the ARC or PAG. Exposure to 70% N(2)O significantly increased dialysate levels of oxidation products of NO as well as β-endorphin, compared to levels in fractions collected under room air. These increases in the ARC and PAG were abolished by systemic pretreatment with L-N(G)-nitro arginine methyl ester (L-NAME). These findings suggest an association between increased NO activity and the stimulated release of β-endorphin during exposure of rats to N(2)O.
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Affiliation(s)
- Yusuke Ohgami
- Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, WA 99164-6534, USA
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126
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Murugaiyan S, Bae JY, Wu J, Lee SD, Um HY, Choi HK, Chung E, Lee JH, Lee SW. Characterization of filamentous bacteriophage PE226 infecting Ralstonia solanacearum strains. J Appl Microbiol 2010; 110:296-303. [PMID: 21054700 DOI: 10.1111/j.1365-2672.2010.04882.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS The aim of this study was to isolate and characterize new bacteriophages that infect a wide range of plant pathogenic Ralstonia solanacearum strains. METHODS AND RESULTS Fifteen bacteriophages were isolated from pepper, tomato and tobacco plant rhizospheres infected with R. solanacearum. A host specificity analysis of the isolated phages using nine strains of R. solanacearum indicated great phage diversity in a single soil. Two phages, PE226 and TM227, showed clear plaques on all nine bacterial hosts tested and were virtually identical in morphology and genome. PE226, an Inovirus, is a long, flexible, filamentous phage carrying a circular (+) sense single-strand DNA genome of 5475 nucleotides. DNA sequences of PE226 exhibited nine open reading frames (ORF) that were not highly similar to those of other phages infecting R. solanacearum. The genome organization of PE226 was partially similar to that of p12J of Ralstonia pickettii. One ORF of PE226 showed identity to the zot gene encoding zonula occludens toxin of Vibrio cholera. Orf7 of PE226 was also present in the genome of R. solanacearum strain SL341. However, SL341, a highly virulent strain in tomato, was still sensitive to phage PE226. CONCLUSIONS A new, flexible, filamentous phage PE226 infected wide range of R. solanacearum strains and carried unique circular single-strand DNA genome with an ORF encoding Zot-like protein. SIGNIFICANCE AND IMPACT OF THE STUDY PE226 may be a new type of temperate phage, based on its lytic nature on a wide range of hosts and the presence of a zot homologue in a host bacterial genome.
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Affiliation(s)
- S Murugaiyan
- Department of Applied Biology, College of Natural Resources and Life Science, Dong-A University, Busan, Korea
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127
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Ohgami Y, Elstad CA, Chung E, Shirachi DY, Quock RM, Lai HC. Effect of hyperbaric oxygen on the anticancer effect of artemisinin on molt-4 human leukemia cells. Anticancer Res 2010; 30:4467-4470. [PMID: 21115894] [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: 05/30/2023]
Abstract
BACKGROUND Artemisinin selectively kills cancer cells which have more intracellular free iron than do normal cells. Hyperbaric oxygen (HBO(2)) may be beneficial in the treatment of cancer. The hypothesis of this study was that HBO(2) enhances anticancer activity of artemisinin. MATERIALS AND METHODS After pretreatment with 12 μM holotransferrin, Molt-4 human leukemia cells were cultured in 10 μM artemisinin and exposed for 90 min to one of three different conditions: control, room air control, and HBO(2). Cell growth was determined for 48 h after exposure. RESULTS Differences in growth were noted after 6 h of incubation. After 48 h of incubation, growth of cells treated with artemisinin alone or HBO(2) alone was 85% of that of cells grown under artemisinin-free control conditions. Combined artemisinin and HBO(2) treatment resulted in an additional 22% decrease in growth. CONCLUSION Combined HBO(2) and artemisinin exposure may be an effective anticancer chemotherapeutic strategy.
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Affiliation(s)
- Yusuke Ohgami
- Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, WA 99164, USA
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128
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Chung E, Aditya P, Balter J, Hayman J, Thompson B, Gemmete J, Tsien C. Predictive Factors in the Obliteration Rate of Arteriovenous Malformations (AVMs) using Linac Based Stereotactic Radiosurgery (SRS). Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.629] [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: 11/28/2022]
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129
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Quock LP, Zhang Y, Chung E, Ohgami Y, Shirachi DY, Quock RM. The acute antinociceptive effect of HBO₂ is mediated by a NO-cyclic GMP-PKG-KATP channel pathway in mice. Brain Res 2010; 1368:102-7. [PMID: 20977894 DOI: 10.1016/j.brainres.2010.10.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 10/16/2010] [Accepted: 10/20/2010] [Indexed: 10/18/2022]
Abstract
Previous research has found that hyperbaric oxygen (HBO(2)) produces an acute antinociceptive effect that is dependent on nitric oxide (NO). The present study was undertaken to determine whether HBO(2)-induced acute antinociception might involve a NO-cyclic GMP-protein kinase G-ATP-sensitive potassium (K(ATP)) channel pathway. Male NIH Swiss mice were subjected to a 5-min HBO(2) treatment (100% oxygen at 3.5 absolute atmospheres) and antinociception was assessed over the next 6 min still under HBO(2) using the acetic acid abdominal constriction test. Pretreatment with 2-(4-carboxyphenyl)-4,5-dihydro-4,4,5,5-tetramethyl-1H-imidazolyl-1-oxy-3-oxide (carboxy-PTIO, an NO scavenger), 1H-[1,2,4]-oxadiazolo-[4,3-a]quinoxalin-1-one) (a soluble guanylyl cyclase-inhibitor, Rp-8-(4-chlorophenylthio)-guanosine-3',5'-cyclic monophosphorothioate (a protein kinase G-inhibitor) or glibenclamide (an ATP-sensitive potassium channel-inhibitor) all led to antagonism of the HBO(2)-induced acute antinociception in a dose-dependent manner. These findings suggest that HBO(2)-induced acute antinociception might be due to activation of a NO-cyclic GMP-protein kinase G-K(ATP) channel pathway.
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Affiliation(s)
- Lindsay P Quock
- Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, WA 99164-6534, USA
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130
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Chung E, Heimiller J, Leinwand LA. Pregnancy and Exercise-induced Cardiac Hypertrophy are Distinct. Med Sci Sports Exerc 2010. [DOI: 10.1249/01.mss.0000389322.23656.ad] [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: 11/21/2022]
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131
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Sarfehnia A, Clasie B, Chung E, Lu HM, Flanz J, Cascio E, Engelsman M, Paganetti H, Seuntjens J. Poster - Thur Eve - 64: A Water Calorimetry-Based Dosimetry Standard for Direct Measurement of Absolute Absorbed Dose in Scanning Proton Beam Delivery. Med Phys 2010. [DOI: 10.1118/1.3476169] [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: 11/07/2022] Open
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132
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Chung E, Soisson E, Bouchard H, Seuntjens J. Sci-Fri PM: Delivery - 03: Application of Advanced Dosimetry Techniques to Nonstandard Field Deliveries. Med Phys 2010. [DOI: 10.1118/1.3476191] [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: 11/07/2022] Open
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133
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Sarfehnia A, Clasie B, Chung E, Lu HM, Flanz J, Cascio E, Engelsman M, Paganetti H, Seuntjens J. Direct absorbed dose to water determination based on water calorimetry in scanning proton beam delivery. Med Phys 2010; 37:3541-50. [DOI: 10.1118/1.3427317] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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134
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Chung E, Soisson E, Bouchard H, Seuntjens J. TH-C-BRB-06: Advanced Dosimetry Techniques for Accurate Dose Measurement of Small and Nonstandard Fields. Med Phys 2010. [DOI: 10.1118/1.3469490] [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: 11/07/2022] Open
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135
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Sarfehnia A, Clasie B, Chung E, Lu H, Flanz J, Cascio E, Engelsman M, Paganetti H, Seuntjens J. SU-EE-A2-01: Direct Measurement of Absolute Absorbed Dose in Scanning Proton Beams Based on Water Calorimetry. Med Phys 2010. [DOI: 10.1118/1.3468012] [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: 11/07/2022] Open
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136
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Bouchard H, Kawrakow I, Carrier J, Lacroix F, Chung E, Seuntjens J. TH-C-BRB-08: Improving Reference Dosimetry of Nonstandard Beams. Med Phys 2010. [DOI: 10.1118/1.3469492] [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: 11/07/2022] Open
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137
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Chung E, Seuntjens J. SU-GG-T-344: Comparison of Characteristics of Two Liquid-Filled Ionization Chambers. Med Phys 2010. [DOI: 10.1118/1.3468741] [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: 11/07/2022] Open
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138
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Chung E, Zelinski LM, Ohgami Y, Shirachi DY, Quock RM. Hyperbaric oxygen treatment induces a 2-phase antinociceptive response of unusually long duration in mice. J Pain 2010; 11:847-53. [PMID: 20418186 DOI: 10.1016/j.jpain.2009.12.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 11/23/2009] [Accepted: 12/02/2009] [Indexed: 01/26/2023]
Abstract
UNLABELLED Hyperbaric oxygen (HBO(2)) therapy is approved by the FDA for limited clinical indications but is reported to produce pain relief in several chronic pain conditions. However, there have been no studies to explain this apparent analgesic effect of HBO(2). Research conducted in our laboratory demonstrates that 4 daily 60-minute HBO(2) treatments at 3.5 absolute atmospheres induced an unparalleled antinociceptive response that consists of 1) an early phase that lasted at least 6 hours after the HBO(2) treatment before dissipating; and 2) a late phase that emerged about 18 hours after the early phase and lasted for up to 3 weeks. The early phase was sensitive to antagonism by acutely intracerebroventricular (i.c.v.)-administered opioid antagonist naltrexone and the nitric oxide synthase (NOS)-inhibitor L-NAME. The late phase was inhibited by treatment with i.c.v. naltrexone or L-NAME during the 4 daily HBO(2) treatments but was not antagonized by either naltrexone or L-NAME following acute pretreatment 2 weeks after HBO(2) treatment. These experimental results implicate a novel mechanism that is activated by HBO(2), resulting in an antinociceptive response of unusually long duration that is of potential interest in the clinical management of pain. PERSPECTIVE Hyperbaric oxygen treatment of mice can induce a 2-phase antinociceptive response of unusually long duration. Nitric oxide and opioid receptors appear to initiate or mediate both phases of the antinociceptive response. Further elucidation of the underlying mechanism may potentially identify molecular targets that cause long-lasting activation of endogenous analgesic systems.
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Affiliation(s)
- Eunhee Chung
- Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, Washington, USA
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139
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Baek K, Park K, Jung E, Chung E, Park J, Choi H, Baek S, Jee Y, Cheon D, Ahn G. Molecular and epidemiological characterization of enteroviruses isolated in Chungnam, Korea from 2005 to 2006. J Microbiol Biotechnol 2010; 19:1055-64. [PMID: 19809266 DOI: 10.4014/jmb.0810.584] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Enteroviruses were identified and characterized from patients with aseptic meningitis and other enterovirusrelated diseases in Chungnam, Korea from 2005 to 2006. Enteroviruses were isolated from 79 of 519 cases (15.2%) in 2005, and 37 of 386 cases (9.6%) in 2006. Based on partial VP1 sequencing, a total of 116 enterovirus isolates were resolved into 13 types. Prevalent among the Chungnam isolates were echovirus 18 and coxsackievirus B5 in 2005, and echoviruses 5 and 25 in 2006. This is the first time echoviruses 5 and 18 have been identified in Korea since enterovirus surveillance began there in 1993. The temporal distribution of enterovirus epidemics in Chungnam showed a remarkable seasonal pattern, with cases occurring during most of the three months of the summer from June to August. The highest rate of enterovirus-positive cases occurred in patients less than 1 year of age. The ratio of male to female enterovirus-positive patients was approximately 1.8:1. Comparison of the VP1 amino acid sequences of the 15 coxsackievirus B5 isolates with reference strains revealed that all Chungnam isolates are substituted at positions 23 (V23I), 19 (S19G), 75 (Y75F), and 95 (N95S). Upon comparing the nine ECV5 isolates with foreign strains, it was found that only the Chungnam isolates, with the exception of Kor06-ECV5-239cn, have P at position 153 and F at position 146. The three ECV9 isolates from 2006 show alterations at amino acids 36, 148, and 154 outside of the BC-loop and at position 84 in the BC-loop, whereas the seven isolates from 2005 and the other ECV9 strains in the database only show the alteration at position 84 (D, I, N, S). The five ECV25 isolates have an S residue at position 134, whereas most of the foreign strains have an N residue.
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Affiliation(s)
- Kyungah Baek
- Chungcheongnam-Do Health and Environment Research Institute, Daejeon 300-801, Korea
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140
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Chung E, Urick M, Kurshan N, Shield W, Riley H, Citrin D. The Mitogen-activated Protein Kinase (MAPK)/Extracellular Signal-regulated Kinase (ERK) 1/2 Kinase Inhibitor, AZD6244 (ARRY-142886) Enhances Radiosensitivity by Interfering with Radiation-induced TGF-alpha Signaling. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1290] [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: 11/28/2022]
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141
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Cope JL, Chung E, Ohgami Y, Quock RM. Antagonism of the antinociceptive effect of nitrous oxide by inhibition of enzyme activity or expression of neuronal nitric oxide synthase in the mouse brain and spinal cord. Eur J Pharmacol 2009; 626:234-8. [PMID: 19818753 DOI: 10.1016/j.ejphar.2009.09.059] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2009] [Revised: 09/18/2009] [Accepted: 09/28/2009] [Indexed: 01/08/2023]
Abstract
Previous studies have implicated nitric oxide (NO) in the antinociceptive response to the anesthetic gas nitrous oxide (N(2)O). The present study was conducted to confirm this NO involvement using pharmacological and gene knockdown and knockout strategies to inhibit the supraspinal and spinal production of NO. Antinociceptive responsiveness to 70% N(2)O was assessed using the acetic acid (0.6%) abdominal constriction test in NIH Swiss mice following intracerebroventricular (i.c.v.) or intrathecal (i.t.) pretreatment with the NOS-inhibitor l-N(G)-nitro arginine methyl ester (L-NAME) or an antisense oligodeoxynucleotide (AS-ODN) directed against neuronal NOS (nNOS). Experiments were also conducted in mice homozygous for a defective nNOS gene (nNOS(-/-)). Mice that were pretreated i.c.v. or i.t. with L-NAME (1.0 microg) both exhibited 80-90% reduction in the magnitude of the N(2)O-induced antinociceptive response. Mice that were pretreated i.c.v. or i.t. with nNOS AS-ODN (3 x 25microg) exhibited a 60-80% antagonism of the antinociceptive response. Compared to wild-type mice, nNOS knockout mice showed a 60% reduction in N(2)O-induced antinociception. These findings consistently demonstrate that transient or developmental suppression of nNOS expression significantly reduces antinociceptive responsiveness to N(2)O. NO of both supraspinal and spinal origin, therefore, plays an important role in the antinociceptive response to N(2)O.
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Affiliation(s)
- Jessica Lack Cope
- Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Pullman, Washington 99164-6534, USA
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142
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Chung E, Bouchard H, Sutherland J, Seuntjens J. TU-D-BRB-02: Advanced Techniques to Determine Plan-Class Specific Reference Field Correction Factors for Accurate Dosimetry of Nonstandard Beams. Med Phys 2009. [DOI: 10.1118/1.3182368] [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: 11/07/2022] Open
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143
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Kang CH, Chung E, Diffee G, Ji LL. Exercise Training Attenuates Aging-associated Reduction In Mitochondrial Biogenesis In Rat Skeletal Muscle. Med Sci Sports Exerc 2009. [DOI: 10.1249/01.mss.0000353449.06824.c0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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144
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Ohgami Y, Chung E, Lai HC, Quock RM, Elstad CA. The effect of hyperbaric oxygen (HBO
2
) on the anticancer effect of artemesinin (ART) on Molt‐4 human leukemia cells. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.925.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yusuke Ohgami
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | - Eunhee Chung
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | - Henry C Lai
- BioengineeringUniversity of WashingtonSeattleWA
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145
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Chung E, Zelinski LM, Ohgami Y, Shirachi DY, Quock RM. Hyperbaric oxygen (HBO
2
) induces a two‐phase antinociceptive response of unusually long duration in mice. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.742.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eunhee Chung
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | | | - Yusuke Ohgami
- Pharmaceutical SciencesWashington State UniversityPullmanWA
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146
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Chung E, Leinwand LA. Quantitative responses of the mouse heart to pregnancy. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.969.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Eunhee Chung
- Molecular, Cellular, and Developmental BiologyUniversity of Colorado‐BoulderBoulderCO
| | - Leslie A. Leinwand
- Molecular, Cellular, and Developmental BiologyUniversity of Colorado‐BoulderBoulderCO
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147
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Winkle CK, Rich RM, Chung E, Shirachi DY, Quock RM. Differential involvement of 5‐hydroxytryptamine
1A
(5‐HT
1A
) receptors in the antinociceptive effects of hyperbaric oxygen (HBO
2
) and nitrous oxide (N
2
O) in mice. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.742.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Roxanne M Rich
- Pharmaceutical SciencesWashington State UniversityPullmanWA
| | - Eunhee Chung
- Pharmaceutical SciencesWashington State UniversityPullmanWA
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148
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149
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Affiliation(s)
- D. Errampalli
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - J. T. Trevors
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - H. Lee
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - K. Leung
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - M. Cassidy
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - K. Knoke
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - T. Marwood
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - K. Shaw
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - M. Blears
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
| | - E. Chung
- a Department of Environmental Biology , University of Guelph , Guelph, Ontario, N1G 2W1, Canada
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150
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Zelinski LM, Ohgami Y, Chung E, Shirachi DY, Quock RM. A prolonged nitric oxide-dependent, opioid-mediated antinociceptive effect of hyperbaric oxygen in mice. J Pain 2008; 10:167-72. [PMID: 18976963 DOI: 10.1016/j.jpain.2008.08.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Revised: 08/07/2008] [Accepted: 08/16/2008] [Indexed: 11/25/2022]
Abstract
UNLABELLED Hyperbaric oxygen (HBO(2)) therapy is reported to cause pain relief in several conditions of chronic pain. A single 60-minute session of HBO(2) treatment produced a prolonged antinociceptive effect in mice that persisted for 90 minutes after cessation of treatment. The HBO(2)-induced antinociception was significantly attenuated by pretreatment before HBO(2) exposure with the opioid antagonist naltrexone, the nonspecific nitric oxide synthase (NOS)-inhibitor N(G)-nitro-L-arginine methyl ester (L-NAME), and the selective neuronal NOS-inhibitor S-methyl-L-thiocitrulline (SMTC) but not the selective endothelial NOS-inhibitor N(5)-(1-iminoethyl)-L-ornithine (L-NIO). The antinociception was also significantly reduced by central pretreatment with a rabbit antiserum against dynorphin(1-13) but not by rabbit antisera against either beta-endorphin or methionine-enkephalin. The prolonged antinociceptive effect at 90 minutes after HBO(2)-induced treatment was also significantly attenuated by naltrexone but not L-NAME administered 60 minutes after HBO(2) treatment but before nociceptive testing. These findings indicate that the antinociception that persists for 90 minutes after HBO(2) exposure is mediated by nitric oxide (NO) and opioid mechanisms but that the NO involvement is critical during the HBO(2) treatment and not at the time of nociceptive testing. These results are consistent with the concept that HBO(2) may induce an NO-dependent release of opioid peptide to cause a long-acting antinociceptive effect. PERSPECTIVE This article presents evidence of a persistent antinociceptive effect of hyperbaric oxygen treatment that is mediated by opioid and NO mechanisms. Further elucidation of the underlying mechanism could identify molecular targets to cause a longer-acting activation of endogenous pain-modulating systems.
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Affiliation(s)
- Lisa M Zelinski
- Department of Pharmaceutical Sciences, College of Pharmacy, Pullman, Washington, USA
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