DOCSLIB.ORG

Download Product Insert (PDF)

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Download Product Insert (PDF) PRODUCT INFORMATION Kynurenic Acid (hydrate) Item No. 16792 CAS Registry No.: 345909-35-5 Formal Name: 4-hydroxy-2-quinolinecarboxylic O acid, hydrate N Synonym: NSC 58973 OH MF: C10H7NO3 • XH2O FW: 189.2 • XH O Purity: ≥98% 2 UV/Vis.: λmax: 220, 239, 340 nm OH Supplied as: A crystalline solid Storage: -20°C Stability: As supplied, 2 years from the QC date provided on the Certificate of Analysis, when stored properly Laboratory Procedures Kynurenic acid (hydrate) is supplied as a crystalline solid. Kynurenic acid (hydrate) is sparingly soluble in organic solvents such as ethanol, DMSO, and dimethyl formamide. For biological experiments, we suggest that organic solvent-free aqueous solutions of kynurenic acid (hydrate) be prepared by directly dissolving the crystalline solid in aqueous buffers. The solubility of kynurenic acid (hydrate) in 0.1 M NaOH is approximately 1 mg/ml. We do not recommend storing the aqueous solution for more than one day. Description Kynurenic acid is a natural metabolite of tryptophan via the kynurenine pathway. It has pronounced effects on neuronal signaling and, thus, impacts diverse neurological systems.1,2 Kynurenic acid broadly antagonizes ionotopic glutamate receptors at high micromolar to millimolar concentrations and is used to pharmacologically block the activation of these receptors in vivo or in vitro.3 In addition, it reportedly has more potent effects at glutamate receptor subunit ζ-1 (Ki = 5.4 µM), GPR35 (EC50 = 39 µM), aryl hydrocarbon 2,4-6 receptor (EC50 = 300 nM), and neuronal acetylcholine receptor α-7 (IC50 = 7 µM). References 1. Schwarcz, R., Bruno, J.P., Muchowski, P.J., et al. Kynurenines in the mammalian brain: When physiology meets pathology. Nat. Rev. Neurosci. 13(7), 465-477 (2012). 2. Turski, M.P., Turska, M., Paluszkiewicz, P., et al. Kynurenic acid in the digestive system-new facts, new challenges. Int. J. Tryptophan Res. 6, 47-55 (2013). 3. Albuquerque, E.X. and Schwarcz, R. Kynurenic acid as an antagonist of α7 nicotinic acetylcholine receptors in the brain: Facts and challenges. Biochem. Pharmacol. 85(8), 1027-1032 (2013). 4. McQuaid, L.A., Smith, E.C., Lodge, D., et al. 3-Phenyl-4-hydroxyquinolin-2(1H)-ones: Potent and selective antagonists at the strychnine-insensitive glycine site on the N-methyl-D-aspartate receptor complex. J. Med. Chem. 35(18), 3423-3425 (1992). 5. Wang, J., Simonavicius, N., Wu, X., et al. Kynurenic acid as a ligand for orphan G protein-coupled receptor GPR35. J. Biol. Chem. 281(31), 22021-22028 (2006). 6. Funke, M., Thimm, D., Schiedel, A.C., et al. 8-Benzamidochromen-4-one-2-carboxylic acids: Potent and selective agonists for the orphan G protein-coupled receptor GPR35. J. Med. Chem. 56(12), 5182-5197 (2013). WARNING CAYMAN CHEMICAL THIS PRODUCT IS FOR RESEARCH ONLY - NOT FOR HUMAN OR VETERINARY DIAGNOSTIC OR THERAPEUTIC USE. 1180 EAST ELLSWORTH RD SAFETY DATA ANN ARBOR, MI 48108 · USA This material should be considered hazardous until further information becomes available. Do not ingest, inhale, get in eyes, on skin, or on clothing. Wash thoroughly after handling. Before use, the user must review the complete Safety Data Sheet, which has been sent via email to your institution. PHONE: [800] 364-9897 WARRANTY AND LIMITATION OF REMEDY [734] 971-3335 Buyer agrees to purchase the material subject to Cayman’s Terms and Conditions. Complete Terms and Conditions including Warranty and Limitation of Liability information can be found on our website. FAX: [734] 971-3640 [email protected] Copyright Cayman Chemical Company, 03/13/2017 WWW.CAYMANCHEM.COM.
Load more

Recommended publications
  • Amino Acid Analysis in Biological Fluids by GC-MS
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by University of Regensburg Publication Server Amino acid analysis in biological fluids by GC-MS Dissertation zur Erlangung des Doktorgrades der Naturwissenschaften (Dr. rer. nat.) an der Fakultät für Chemie und Pharmazie der Universität Regensburg vorgelegt von Hannelore Kaspar aus Fürstenfeldbruck Juni 2009 Diese Doktorarbeit entstand in der Zeit von Oktober 2005 bis Juni 2009 am Institut für Funktionelle Genomik der Universität Regensburg. Die Arbeit wurde angeleitet von Prof. Dr. Peter J. Oefner. Promotionsgesuch eingereicht im Juni 2009 Kolloquiumstermin: 17.07.2009 Prüfungsausschuß: Vorsitzender: Prof. Dr. Manfred Scheer Erstgutachter: Prof. Dr. Frank-Michael Matysik Zweitgutachter: Prof. Dr. Peter J. Oefner Drittprüfer: Prof. Dr. Jörg Heilmann Für meine Eltern Danksagung Diese Doktorarbeit ist ein großer Meilensteil in meinem bisherigen Leben, den ich durch großartige Unterstützung von vielen lieben Leuten meistern konnte. Den allerwichtigsten Menschen möchte ich hier danken. Als erstes bedanke ich mich bei Prof. PJ. Oefner dafür in seinem Institut promovieren zu dürfen sowie für seinen unermüdlichen Einsatz seinen Mitarbeitern stets die besten Möglichkeiten in Sachen Forschung zu bieten und Kooperationen aufzubauen und zu fördern. Ein besonderes Dankeschön geht auch an Prof. Matysik für die freundliche Übernahme des Erstgutachtens. Bei Prof. Heilmann bedanke ich mich für die Bereitschaft an meiner Prüfung teilzunehmen sowie Prof. Scheer für die Übernahme des Prüfungsvorsitzes. Den allergrößten Dank möchte ich meiner Betreuerin und Mentorin Dr. Katja Dettmer aussprechen. Nicht nur für ihre hervorragende fachliche Betreuung währen meiner Doktorarbeit sondern auch für die vielen freundlichen und aufbauenden Worte, die Weitergabe ihres Wissens und vor allem dafür, dass Sie mir das Gefühl gab als Mensch und Wissenschaftler wichtig und wertvoll zu sein.
    [Show full text]
  • NINDS Custom Collection II
    ACACETIN ACEBUTOLOL HYDROCHLORIDE ACECLIDINE HYDROCHLORIDE ACEMETACIN ACETAMINOPHEN ACETAMINOSALOL ACETANILIDE ACETARSOL ACETAZOLAMIDE ACETOHYDROXAMIC ACID ACETRIAZOIC ACID ACETYL TYROSINE ETHYL ESTER ACETYLCARNITINE ACETYLCHOLINE ACETYLCYSTEINE ACETYLGLUCOSAMINE ACETYLGLUTAMIC ACID ACETYL-L-LEUCINE ACETYLPHENYLALANINE ACETYLSEROTONIN ACETYLTRYPTOPHAN ACEXAMIC ACID ACIVICIN ACLACINOMYCIN A1 ACONITINE ACRIFLAVINIUM HYDROCHLORIDE ACRISORCIN ACTINONIN ACYCLOVIR ADENOSINE PHOSPHATE ADENOSINE ADRENALINE BITARTRATE AESCULIN AJMALINE AKLAVINE HYDROCHLORIDE ALANYL-dl-LEUCINE ALANYL-dl-PHENYLALANINE ALAPROCLATE ALBENDAZOLE ALBUTEROL ALEXIDINE HYDROCHLORIDE ALLANTOIN ALLOPURINOL ALMOTRIPTAN ALOIN ALPRENOLOL ALTRETAMINE ALVERINE CITRATE AMANTADINE HYDROCHLORIDE AMBROXOL HYDROCHLORIDE AMCINONIDE AMIKACIN SULFATE AMILORIDE HYDROCHLORIDE 3-AMINOBENZAMIDE gamma-AMINOBUTYRIC ACID AMINOCAPROIC ACID N- (2-AMINOETHYL)-4-CHLOROBENZAMIDE (RO-16-6491) AMINOGLUTETHIMIDE AMINOHIPPURIC ACID AMINOHYDROXYBUTYRIC ACID AMINOLEVULINIC ACID HYDROCHLORIDE AMINOPHENAZONE 3-AMINOPROPANESULPHONIC ACID AMINOPYRIDINE 9-AMINO-1,2,3,4-TETRAHYDROACRIDINE HYDROCHLORIDE AMINOTHIAZOLE AMIODARONE HYDROCHLORIDE AMIPRILOSE AMITRIPTYLINE HYDROCHLORIDE AMLODIPINE BESYLATE AMODIAQUINE DIHYDROCHLORIDE AMOXEPINE AMOXICILLIN AMPICILLIN SODIUM AMPROLIUM AMRINONE AMYGDALIN ANABASAMINE HYDROCHLORIDE ANABASINE HYDROCHLORIDE ANCITABINE HYDROCHLORIDE ANDROSTERONE SODIUM SULFATE ANIRACETAM ANISINDIONE ANISODAMINE ANISOMYCIN ANTAZOLINE PHOSPHATE ANTHRALIN ANTIMYCIN A (A1 shown) ANTIPYRINE APHYLLIC
    [Show full text]
  • Linking Phencyclidine Intoxication to the Tryptophan-Kynurenine Pathway Therapeutic Implications for Schizophrenia
    Neurochemistry International 125 (2019) 1–6 Contents lists available at ScienceDirect Neurochemistry International journal homepage: www.elsevier.com/locate/neuint Linking phencyclidine intoxication to the tryptophan-kynurenine pathway: Therapeutic implications for schizophrenia T ∗ Hidetsugu Fujigakia, ,1, Akihiro Mourib,c,1, Yasuko Yamamotoa, Toshitaka Nabeshimac,d, Kuniaki Saitoa,c,d,e a Department of Disease Control and Prevention, Fujita Health University Graduate School of Health Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470- 1192, Japan b Department of Regulatory Science, Fujita Health University Graduate School of Health Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan c Japanese Drug Organization of Appropriate Use and Research, 3-1509 Omoteyama, Tenpaku-ku, Nagoya, Aichi 468-0069, Japan d Advanced Diagnostic System Research Laboratory, Fujita Health University Graduate School of Health Sciences, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan e Human Health Sciences, Graduate School of Medicine and Faculty of Medicine, Kyoto University, 54 Shogoinkawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan ARTICLE INFO ABSTRACT Keywords: Phencyclidine (PCP) is a dissociative anesthetic that induces psychotic symptoms and neurocognitive deficits in Phencyclidine rodents similar to those observed in schizophrenia patients. PCP administration in healthy human subjects in- Kynurenic acid duces schizophrenia-like symptoms such as positive and negative symptoms, and a range of cognitive deficits. It Quinolinic acid has been reported that PCP, ketamine, and related drugs such as N-methyl-D-aspartate-type (NMDA) glutamate Kynurenine pathway receptor antagonists, induce behavioral effects by blocking neurotransmission at NMDA receptors. Further, Schizophrenia NMDA receptor antagonists reproduce specific aspects of the symptoms of schizophrenia.
    [Show full text]
  • Agmatine Modulates Spontaneous Activity in Neurons of the Rat Medial
    Weiss et al. Translational Psychiatry (2018) 8:201 DOI 10.1038/s41398-018-0254-z Translational Psychiatry ARTICLE Open Access Agmatine modulates spontaneous activity in neurons of the rat medial habenular complex—a relevant mechanism in the pathophysiology and treatment of depression? Torsten Weiss1,RenéBernard2, Hans-Gert Bernstein3,RüdigerW.Veh1 and Gregor Laube1 Abstract The dorsal diencephalic conduction system connects limbic forebrain structures to monaminergic mesencephalic nuclei via a distinct relay station, the habenular complexes. Both habenular nuclei, the lateral as well as the medial nucleus, are considered to play a prominent role in mental disorders like major depression. Herein, we investigate the effect of the polyamine agmatine on the electrical activity of neurons within the medial habenula in rat. We present evidence that agmatine strongly decreases spontaneous action potential firing of medial habenular neurons by activating I1-type imidazoline receptors. Additionally, we compare the expression patterns of agmatinase, an enzyme capable of inactivating agmatine, in rat and human habenula. In the medial habenula of both species, agmatinase is similarly distributed and observed in neurons and, in particular, in distinct neuropil areas. The putative relevance of 1234567890():,; 1234567890():,; 1234567890():,; 1234567890():,; these findings in the context of depression is discussed. It is concluded that increased activity of the agmatinergic system in the medial habenula may strengthen midbrain dopaminergic activity. Consequently,
    [Show full text]
  • Resistant Depressed Patients
    Electroconvulsive therapy suppresses the neurotoxic branch of the kynurenine pathway in treatment- resistant depressed patients The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Schwieler, Lilly, Martin Samuelsson, Mark A. Frye, Maria Bhat, Ina Schuppe-Koistinen, Oscar Jungholm, Anette G. Johansson, Mikael Landén, Carl M. Sellgren, and Sophie Erhardt. 2016. “Electroconvulsive therapy suppresses the neurotoxic branch of the kynurenine pathway in treatment-resistant depressed patients.” Journal of Neuroinflammation 13 (1): 51. doi:10.1186/ s12974-016-0517-7. http://dx.doi.org/10.1186/s12974-016-0517-7. Published Version doi:10.1186/s12974-016-0517-7 Citable link http://nrs.harvard.edu/urn-3:HUL.InstRepos:26318660 Terms of Use This article was downloaded from Harvard University’s DASH repository, and is made available under the terms and conditions applicable to Other Posted Material, as set forth at http:// nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of- use#LAA Schwieler et al. Journal of Neuroinflammation (2016) 13:51 DOI 10.1186/s12974-016-0517-7 RESEARCH Open Access Electroconvulsive therapy suppresses the neurotoxic branch of the kynurenine pathway in treatment-resistant depressed patients Lilly Schwieler1*, Martin Samuelsson1,2, Mark A. Frye3, Maria Bhat4,5, Ina Schuppe-Koistinen1,6, Oscar Jungholm1, Anette G. Johansson5, Mikael Landén7,8, Carl M. Sellgren1,9,10 and Sophie Erhardt1 Abstract Background: Neuroinflammation is increasingly recognized as contributing to the pathogenesis of depression. Key inflammatory markers as well as kynurenic acid (KYNA) and quinolinic acid (QUIN), both tryptophan metabolites, have been associated with depressive symptoms and suicidality.
    [Show full text]
  • Kynurenic Acid Underlies Sex-Specific Immune Responses to COVID-19
    medRxiv preprint doi: https://doi.org/10.1101/2020.09.06.20189159; this version posted September 8, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license . Kynurenic acid underlies sex-specific immune responses to COVID-19 Authors Yuping Cai1, Daniel J. Kim2, Takehiro Takahashi2, David I. Broadhurst3, Shuangge Ma4, Nicholas J.W. Rattray5, Arnau Casanovas-Massana6, Benjamin Israelow2,7, Jon Klein2, Carolina Lucas2, Tianyang Mao2, Adam J. Moore6, M. Catherine Muenker6, Jieun Oh2, Julio Silva2, Patrick Wong2, Yale IMPACT Research team, Albert I. Ko6, Sajid A. Khan8, Akiko Iwasaki2,9, Caroline H. Johnson1 1Department of Environmental Health Sciences, Yale School of Public Health, New Haven, CT 06510, USA 2Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA 3Centre for Integrative Metabolomics & Computational Biology, School of Science, Edith Cowan University, Joondalup, 6027, Australia 4Department of Biostatistics, Yale School of Public Health, New Haven, CT 06510, USA 5Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK 6Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA 7Department of Internal Medicine, Section of Infectious Diseases, Yale University School of Medicine, New Haven, CT 06520, USA 8Department of Surgery, Division of Surgical Oncology, Yale University School of Medicine, New Haven, CT 06520, USA 9Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice.
    [Show full text]
  • Phencyclidine Increases Forebrain Monoamine Metabolism in Rats and Monkeys: Modulation by the Isomers of HA966
    The Journal of Neuroscience, March 1, 1997, 17(5):1769–1775 Phencyclidine Increases Forebrain Monoamine Metabolism in Rats and Monkeys: Modulation by the Isomers of HA966 J. David Jentsch,1 John D. Elsworth,2,3 D. Eugene Redmond Jr.,2,4 and Robert H. Roth2,3 Departments of 1Neurobiology, 2Psychiatry, 3Pharmacology, and 4Neurosurgery, Yale University School of Medicine, New Haven, Connecticut 06510 The noncompetitive NMDA receptor antagonist phencyclidine enantiomer altered the effect of PCP on DA turnover in the (PCP) has psychotomimetic properties in humans and activates nucleus accumbens or the PCP-induced increases in serotonin the frontal cortical dopamine innervation in rats, findings that turnover in PFC. PCP (0.3 mg/kg, i.m.) exerted regionally se- have contributed to a hyperdopaminergic hypothesis of schizo- lective effects on the dopaminergic and serotonergic innerva- phrenia. In the present studies, the effects of the enantiomers of tion of the monkey frontal cortex, effects blocked by pretreat- 3-amino-1-hydroxypyrrolid-2-one (HA966) on PCP-induced ment with S-(2)HA966 (3 mg/kg, i.m.). Importantly, these data changes in monoamine metabolism in the forebrain of rats and demonstrate that in the primate, PCP has potent effects on monkeys were examined, because HA966 has been shown dopamine transmission in the frontal cortex, a brain region previously to attenuate stress- or drug-induced activation of thought to be dysfunctional in schizophrenia. In addition, a role dopamine systems. In rats, PCP (10 mg/kg, i.p.) potently acti- for S-(2)HA966 as a modulator of cortical monoamine trans- vated dopamine (DA) turnover in the medial prefrontal cortex mission in primates is posited.
    [Show full text]
  • Nutrient and Food Component Supplementation for Substance Use
    NUTRIENT AND FOOD COMPONENT SUPPLEMENTATION FOR SUBSTANCE USE DISORDER RECOVERY: A SYSTEMATIC REVIEW by Melissa M. Heath, B.S. A thesis submitted to the Graduate Council of Texas State University in partial fulfillment of the requirements for the degree of Master of Science with a Major in Human Nutrition May 2020 Committee Members: Sylvia Crixell, Chair Michelle Lane Ramona Price COPYRIGHT by Melissa M. Heath 2019 FAIR USE AND AUTHOR’S PERMISSION STATEMENT Fair Use This work is protected by the Copyright Laws of the United States (Public Law 94-553, section 107). Consistent with fair use as defined in the Copyright Laws, brief quotations from this material are allowed with proper acknowledgement. Use of this material for financial gain without the author’s express written permission is not allowed. Duplication Permission As the copyright holder of this work I, Melissa M. Heath, refuse permission to copy in excess of the “Fair Use” exemption without my written permission. ACKNOWLEDGEMENTS I would like to thank both Dr. Christopher Jenney and Christina Ramirez for their assistance in the article review process, editing, and manuscript preparation. I would also like to thank Dr. Sylvia Crixell for assisting me with final edits in the manuscript, and Drs. Sylvia Crixell, Michelle Lane, and Ramona Price for their support as committee members iv TABLE OF CONTENTS Page ACKNOWLEDGEMENTS ....................................................................................................... iv LIST OF TABLES ....................................................................................................................
    [Show full text]
  • Research Article Kynurenic Acid Protects Against Thioacetamide-Induced Liver Injury in Rats
    Hindawi Analytical Cellular Pathology Volume 2018, Article ID 1270483, 11 pages https://doi.org/10.1155/2018/1270483 Research Article Kynurenic Acid Protects against Thioacetamide-Induced Liver Injury in Rats 1 2 3 4 Sebastian Marciniak , Artur Wnorowski , Katarzyna Smolińska, Beata Walczyna, 5 5 3 6 Waldemar Turski , Tomasz Kocki, Piotr Paluszkiewicz, and Jolanta Parada-Turska 1Department of Pharmacology, Medical University, Chodźki 4a Street, 20-093 Lublin, Poland 2Department of Biopharmacy, Medical University, Chodźki 4a Street, 23-093 Lublin, Poland 3Department of Surgery and Surgical Nursing, Medical University, Szkolna 18 Street, 20-124 Lublin, Poland 4Department of Clinical Pathomorphology, Medical University, Jaczewskiego 8b Street, 20-090 Lublin, Poland 5Department of Experimental and Clinical Pharmacology, Medical University, Jaczewskiego 8b Street, 20-090 Lublin, Poland 6Department of Rheumatology and Connective Tissue Diseases, Medical University, Jaczewskiego 8 Street, 20-090 Lublin, Poland Correspondence should be addressed to Waldemar Turski; [email protected] Received 7 August 2017; Revised 4 February 2018; Accepted 27 February 2018; Published 20 September 2018 Academic Editor: Andrea Stringer Copyright © 2018 Sebastian Marciniak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Acute liver failure (ALF) is a life-threatening disorder of liver function. Kynurenic acid (KYNA), a tryptophan metabolite formed along the kynurenine metabolic pathway, possesses anti-inflammatory and antioxidant properties. Its presence in food and its potential role in the digestive system was recently reported. The aim of this study was to define the effect of KYNA on liver failure.
    [Show full text]
  • Kynurenic Acid Accelerates Healing of Corneal Epithelium in Vitro and in Vivo
    pharmaceuticals Article Kynurenic Acid Accelerates Healing of Corneal Epithelium In Vitro and In Vivo Anna Matysik-Wo´zniak 1,* , Waldemar A. Turski 2 , Monika Turska 3,4 , Roman Paduch 1,5 , Mirosław Ła ´ncut 6, Paweł Piwowarczyk 7 , Mirosław Czuczwar 7 and Robert Rejdak 1 1 Department of General and Pediatric Ophthalmology, Medical University of Lublin, 20-079 Lublin, Poland; [email protected] (R.P.); [email protected] (R.R.) 2 Department of Experimental and Clinical Pharmacology, Medical University of Lublin, 20-090 Lublin, Poland; [email protected] 3 Department of Pharmacology, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland; [email protected] 4 Postgraduate School of Molecular Medicine, Medical University of Warsaw, 02-091 Warsaw, Poland 5 Department of Virology and Immunology, Institute of Microbiology and Biotechnology, Maria Curie-Skłodowska University, 20-033 Lublin, Poland 6 Center for Experimental Medicine, Medical University of Lublin, 20-090 Lublin, Poland; [email protected] 7 2nd Department of Anesthesiology and Intensive Care, Medical University of Lublin, 20-081 Lublin, Poland; [email protected] (P.P.); [email protected] (M.C.) * Correspondence: [email protected]; Tel.: +48-81532-8601 Abstract: Kynurenic acid (KYNA) is an endogenous compound with a multidirectional effect. It Citation: Matysik-Wo´zniak,A.; possesses antiapoptotic, anti-inflammatory, and antioxidative properties that may be beneficial in the Turski, W.A.; Turska, M.; Paduch, R.; treatment of corneal injuries. Moreover, KYNA has been used successfully to improve the healing Ła´ncut,M.; Piwowarczyk, P.; outcome of skin wounds. The aim of the present study is to evaluate the effects of KYNA on corneal Czuczwar, M.; Rejdak, R.
    [Show full text]
  • Systemic L-Kynurenine Administration Partially Protects Against NMDA
    Systemic L-Kynurenine Administration Partially Protects Against NMDA, But Not Kainate-Induced Degeneration of Retinal Ganglion Cells, and Reduces Visual Discrimination Deficits in Adult Rats Christian K. Vonuerk* MichaelR. Kreutz* Evan B. Dreyer,-f and Bernhard A. Sabel* Purpose. Kynurenic acid (KYNA), an endogenous tryptophan metabolite, is an N-methyl-D- aspartate (NMDA) antagonist active at the glycine-binding site of the NMDA-receptor com- plex. The authors investigated whether systemic administration of a biochemical precursor of KYNA, L-kynurenine (L-Kyn), could block NMDA- or kainic acid (KA)-induced cell death in adult rat retinal ganglion cells (RGCs) and protect NMDA-treated animals from lesion- induced visual deficits. Methods. Rats were injected with 20-nmol NMDA or 5-nmol KA intraocularly. To quantify the number of surviving RGCs, the retrograde tracer horseradish-peroxidase was injected into the superior colliculus contralateral to the lesioned eye. Surviving RGCs were counted on wholemounted retinae in a centroperipheral gradient, as well as in the four quadrants, using a computer-assisted image analysis system. Results. The NMDA-injections resulted in an approximately 82% RGC loss in the adult rat retina compared with control retinae and a cell loss of approximately 50% in KA-treated retinae. Pretreatment with L-Kyn significantly reduced NMDA-induced RGC degeneration to values of approximately 60%, but KA toxicity was not significantly affected by L-Kyn pretreat- ment. Intraocular injections of NMDA resulted in an impairment of visual discrimination behavior, which partially recovered within a period of approximately 3 weeks. However, when treated systemically with L-Kyn, brightness discrimination was significantly improved as com- pared with NMDA-treated rats.
    [Show full text]
  • Kynurenic Acid and Zaprinast Diminished CXCL17-Evoked Pain-Related
    Pharmacological Reports 71 (2019) 139–148 Contents lists available at ScienceDirect Pharmacological Reports journal homepage: www.elsevier.com/locate/pharep Original article Kynurenic acid and zaprinast diminished CXCL17-evoked pain-related behaviour and enhanced morphine analgesia in a mouse neuropathic pain model Ewelina Rojewska, Katarzyna Ciapała, Joanna Mika* Department of Pain Pharmacology, Institute of Pharmacology, Polish Academy of Sciences, Kraków, Poland A R T I C L E I N F O A B S T R A C T Article history: Background: The G protein-coupled receptor 35 (GPR35), is considered important for nociceptive Received 6 June 2018 transmission, as suggested by accumulating evidence. This receptor was discovered in 1998; however, a Received in revised form 3 September 2018 lack of pharmacological tools prevented a complete understanding of its function and how to exploit it Accepted 2 October 2018 therapeutically. We studied the influence of CXCL17, kynurenic acid and zaprinast on nociceptive Available online 6 October 2018 transmission in naïve and neuropathic mice. Additionally, we investigated the influence of kynurenic acid and zaprinast on morphine effectiveness in neuropathic pain. Keywords: Methods: The chronic constriction injury (CCI) of the sciatic nerve in Swiss mice was performed. The CXCL17 CXCL17, kynurenic acid, zaprinast and morphine were injected intrathecally into naive and CCI-exposed Zaprinast mice at day 14. To evaluate tactile and thermal hypersensitivity, the von Frey and cold plate tests were Kynurenic acid Morphine used, respectively. Results: Our results have shown, for the first time, that administration of CXCL17 in naïve mice induced strong pain-related behaviours, as measured by von Frey and cold plate tests.
    [Show full text]