DOCSLIB.ORG

Neural Basis for Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality, and by Hypoglycemia

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Neural Basis for Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality, and by Hypoglycemia Neural Basis for Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality, and by Hypoglycemia The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Kim, Angela. 2020. Neural Basis for Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality, and by Hypoglycemia. Doctoral dissertation, Harvard University, Graduate School of Arts & Sciences. Citable link https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37365939 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 Neural Basis for Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality, and by Hypoglycemia A dissertation presented by Angela Kim to The Division of Medical Sciences in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the subject of Neuroscience Harvard University Cambridge, Massachusetts April 2020 © 2020 Angela Kim All rights reserved. Dissertation Advisor: Bradford B. Lowell Angela Kim Neural Basis for Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality, and by Hypoglycemia Abstract Vasopressin (AVP), released by magnocellular AVP neurons of the hypothalamus, is a multifaceted hormone. AVP regulates many physiological processes including blood osmolality, blood glucose, and blood pressure. In this dissertation, I present two independent studies investigating the neural mechanism for role of AVP in fluid and glucose homeostasis. In regards to regulating water excretion and hence blood osmolality, magnocellular AVP neurons are regulated by two temporally distinct signals: 1) slow systemic signals that convey systemic osmolality information, and 2) rapid ‘presystemic’ signals that anticipate future osmotic challenges. Magnocellular AVP neurons show bidirectional presystemic responses to feeding and drinking. In our first study, we identified and characterized the neural circuits mediating presystemic regulation of AVP release. Using in vivo calcium imaging and opto- and chemo- genetic approaches, we demonstrated that presystemic regulation of magnocellular AVP neurons is mediated by two functionally-distinct neural circuits that transmit information related ingestion of either water or food, which decrease or increase osmolality, respectively. We also validated a brainstem circuit mediating blood pressure information to magnocellular AVP neurons that is completely separate from water- and food-related presystemic circuits. iii Next, we focused on the glucoregulatory function of AVP. We adopted a wide range of in vitro and in vivo techniques in mice and human to provide a comprehensive analysis of central and peripheral pathways mediating AVP’s glucoregulatory effect. We performed the very first in vivo simultaneous real-time monitoring of blood glucose and magnocellular AVP neuron activity in mice to demonstrate robust activation of magnocellular AVP neurons by hypoglycemia. We further demonstrated that A1/C1 neurons in the brainstem mediate this activation. We showed that AVP acts on V1b subtype of AVP receptors specifically expressed on pancreatic alpha cells to stimulate glucagon release, which then stimulates hepatic glucose production. Taken together, our data shows that activity of magnocellular AVP neurons is tightly regulated by multiple functionally-distinct neural circuits. We propose that proper regulation of AVP release is crucial for homeostasis of multiple physiological processes, and dysregulation of AVP release might underlie certain diseases with impaired water and glucose balance. iv Table of Contents Title Page………………………………………………………………………………………….i Copyright Page……………………………………………………….…………………………..ii Abstract……………………………………………................................................................….iii Table of Contents………………………………............................................................……..….v List of Figures………………………………………………………………….........................viii Acknowledgement……………………………………………………………..............................x Chapter 1. Introduction 1.1 Introduction to Vasopressin..................................................................................................2 1.2 Systemic regulation of vasopressin release……………………...........................................4 1.3 New insight into hypothalamic function…...................................................................…....6 1.4 Presystemic regulation of Vasopressin neurons............................................................……8 1.5 Osmotic homeostasis and significance of presystemic regulation......................................12 References….............................................................................................................................16 Chapter 2. Regulation of Vasopressin Secretion by Presystemic Anticipated Disturbances in Osmolality 2.1 Introduction….....................................................................................................................22 2.2 Results 2.2.1 Vasopressin neurons receive inhibitory and excitatory inputs from the LT...............24 2.2.2 Water-related presystemic regulation of vasopressin neurons is mediated by the LT...........................................................................................................................……27 2.2.3 Presystemic signals enter the LT at the level of MnPO..............................................31 2.2.4 SON-projecting LT neurons show presystemic response to water-predicting cues and drinking................................................................................................................................34 2.2.5 The LT does not mediate food-related presystemic regulation of vasopressin Neurons................................................................................................................................37 2.2.6 Vasopressin neurons receive excitatory inputs from A1/C1 neurons in the VLM…..40 v 2.2.7 A1/C1 neurons in the VLM mediate hypotension-induced, but not feeding-induced, activation of vasopressin neurons.........................................................................................43 2.2.8 Perinuclear zone GABAergic neurons do not mediate food-related presystemic regulation of vasopressin neurons........................................................................................45 2.2.9 AgRP and POMC neurons do not mediate food-related presystemic regulation of vasopressin neurons..............................................................................................................48 2.2.10 Food-related presystemic regulation of vasopressin neurons is mediated by unknown neurons in the ARC..............................................................................................51 2.3 Discussion….......................................................................................................................54 2.4 Methods...............................................................................................................................55 References.................................................................................................................................62 Chapter 3. Regulation of Vasopressin Secretion by Hypoglycemia 3.1 Introduction.........................................................................................................................66 3.2 Results 3.2.1 Glucagon secretion in response to an insulin tolerance test is driven by Vasopressin…......................................................................................................................68 3.2.2 Vasopressin evokes hyperglycemia and hyperglucagonemia.....................................75 3.2.3 Hypoglycemia evokes Vasopressin secretion via activation of A1/C1 neurons.........79 3.2.4 Vasopressin -induced glucagon secretion maintains glucose homeostasis during dehydration….......................................................................................................................83 3.2.5 Insulin-induced Vasopressin secretion may underlie counter-regulatory glucagon secretion in human, and is diminished in subjects with Type 1 Diabetes............................85 3.3 Discussion...........................................................................................................................88 3.4 Methods...............................................................................................................................90 References...............................................................................................................................109 Chapter 4. Conclusion 4.1 Summary of findings.........................................................................................................116 4.2 Function of presystemic regulation in Vasopressin neurons.............................................118 4.3 Significance of functionally distinct circuits in regulation of Vasopressin release..........120 4.4 Neural mechanism for stress-induced Vasopressin release..............................................122 vi 4.5 Lack of food-predicting cue response in magnocellular Vasopressin neurons.................123 4.6 Technical consideration: rabies retrograde tracing...........................................................125
Load more

Recommended publications
  • Therapeutic Potential of Vasopressin-Receptor Antagonists in Heart Failure
    J Pharmacol Sci 124, 1 – 6 (2014) Journal of Pharmacological Sciences © The Japanese Pharmacological Society Current Perspective Therapeutic Potential of Vasopressin-Receptor Antagonists in Heart Failure Yasukatsu Izumi1,*, Katsuyuki Miura2, and Hiroshi Iwao1 1Department of Pharmacology, 2Applied Pharmacology and Therapeutics, Osaka City University Medical School, Osaka 545-8585, Japan Received October 2, 2013; Accepted November 17, 2013 Abstract. Arginine vasopressin (AVP) is a 9-amino acid peptide that is secreted from the posterior pituitary in response to high plasma osmolality and hypotension. AVP has important roles in circulatory and water homoeostasis, which are mediated by oxytocin receptors and by AVP receptor subtypes: V1a (mainly vascular), V1b (pituitary), and V2 (renal). Vaptans are orally and intravenously active nonpeptide vasopressin-receptor antagonists. Recently, subtype-selective nonpeptide vasopressin-receptor agonists have been developed. A selective V1a-receptor antago- nist, relcovaptan, has shown initial positive results in the treatment of Raynaud’s disease, dysmen- orrhea, and tocolysis. A selective V1b-receptor antagonist, nelivaptan, has beneficial effects in the treatment of psychiatric disorders. Selective V2-receptor antagonists including mozavaptan, lixivaptan, satavaptan, and tolvaptan induce highly hypotonic diuresis without substantially affecting the excretion of electrolytes. A nonselective V1a/V2-receptor antagonist, conivaptan, is used in the treatment for euvolaemic or hypervolemic hyponatremia. Recent basic and clinical studies have shown that AVP-receptor antagonists, especially V2-receptor antagonists, may have therapeutic potential for heart failure. This review presents current information about AVP and its antagonists. Keywords: arginine vasopressin, diuretic, heart failure, vasopressin receptor antagonist 1. Introduction receptor blockers, diuretics, b-adrenoceptor blockers, digitalis glycosides, and inotropic agents (4).
    [Show full text]
  • Vaptans: a New Option in the Management of Hyponatremia
    [Downloaded free from http://www.ijabmr.org on Monday, August 18, 2014, IP: 218.241.189.21] || Click here to download free Android application for this journal Educational Forum Vaptans: A new option in the management of hyponatremia Suruchi Aditya, Aditya Rattan1 Department of Pharmacology, Dr. Harvansh Singh Judge Institute of Dental Sciences, Chandigarh. 1Consultant Cardiologist, Heartline, Panchkula, Haryana, India Abstract Arginine vasopressin (AVP) plays an important role in water and sodium homeostasis. It acts via three receptor subtypes— V1a, V 1b, and V2—distributed widely throughout the body. Vaptans are nonpeptide vasopressin receptor antagonists (VRA). By property of aquaresis, VRAs offer a novel therapy of water retention. Conivaptan is a V1a/V2 nonselective VRA approved for euvolemic and hypervolemic hyponatremia. Tolvaptan is the first oral VRA. Other potential uses of this new class of drugs include congestive heart failure (CHF), cirrhosis of liver, syndrome of inappropriate secretion of antidiuretic hormone, polycystic kidney disease, and so on. These novel drugs score over diuretics as they are not associated with electrolyte abnormalities. Though much remains to be elucidated before the VRAs are applied clinically, the future holds much promise. Key words: Aquaresis, hyponatremia, syndrome of inappropriate antidiuretic hormone secretion, vaptan, vasopressin receptor antagonists Introduction hormone (ADH), renin angiotensin aldosterone system (RAAS), sympathetic nervous system (SNS), and thirst help Hyponatremia, one of the most common electrolyte to control water homeostasis in the body and keep plasma abnormalities in hospitalized patients, is defined as serum osmolality between 275 and 290 mOsm/kg water. sodium concentration <135 mEq/L. Its prevalence is one in five of all hospitalized patients.[1] Recent clinical data suggests Hyponatremia can be associated with low, normal, or high that hyponatremia is not only a marker of disease severity but tonicity.
    [Show full text]
  • New Approaches of the Hyponatremia Treatment in the Elderly – an Update
    FARMACIA, 2020, Vol. 68, 3 https://doi.org/10.31925/farmacia.2020.3.5 REVIEW NEW APPROACHES OF THE HYPONATREMIA TREATMENT IN THE ELDERLY – AN UPDATE ALICE BĂLĂCEANU 1,2#, SECIL OMER 1,2, SILVIU ADRIAN MARINESCU 1,3*, SILVIU MIREL PIȚURU 1#, ȘERBAN DUMITRACHE 2#, DANIELA ELENA POPA 1, ANDREEA ANTONIA GHEORGHE 2, SIRAMONA POPESCU 3, CĂTĂLIN BEJINARIU 3, OCTAV GINGHINĂ 1,2, CARMEN GIUGLEA 1,2 1“Carol Davila” University of Medicine and Pharmacy, 37 Dionisie Lupu Street, 020021, Bucharest, Romania 2“Sf. Ioan” Clinical Emergency Hospital, 13 Vitan-Bârzești Road, 042122, Bucharest, Romania 3“Bagdasar Arseni” Clinical Emergency Hospital, 12 Berceni Road, 041915, Bucharest, Romania *corresponding author: [email protected] #Authors with equal contribution. Manuscript received: December 2019 Abstract Hyponatremia (hNa) is a frequently common imbalance in the elderly hospitalized patients. It is often correlated with elevated plasma quantities of arginine vasopressin (AVP, the antidiuretic hormone) and namely it depicts a water surplus in order to prevail sodium levels. It can conduct, in a comprehensive range, to detrimental changes that can affect the entire health status, especially the central nervous system, thus increasing the mortality and morbidity of hospitalized patients in care units. The inherent treatment of hNa, mainly of the chronic form, requires the correction of serum sodium concentrations at the appropriate rate, because, augmenting it at a warp speed, it can determine permanent or fatal neurologic sequelae. In this regard, the therapy for hNa may be enlightened by egressing therapies that include vasopressin V2 and V1a receptors antagonists, with the principal role of encouraging aquaresis and rise the serum sodium levels, alongside with the electrolyte- sparing discharge of free water.
    [Show full text]
  • The Use of Stems in the Selection of International Nonproprietary Names (INN) for Pharmaceutical Substances" WHO/EMP/RHT/TSN/2013.1
    INN Working Document 18.435 31/05/2018 Addendum1 to "The use of stems in the selection of International Nonproprietary names (INN) for pharmaceutical substances" WHO/EMP/RHT/TSN/2013.1 Programme on International Nonproprietary Names (INN) Technologies Standards and Norms (TSN) Regulation of Medicines and other health technologies (RHT) World Health Organization, Geneva © World Health Organization 2018 - All rights reserved. The contents of this document may not be reviewed, abstracted, quoted, referenced, reproduced, transmitted, distributed, translated or adapted, in part or in whole, in any form or by any means, without explicit prior authorization of the WHO INN Programme. This document contains the collective views of the INN Expert Group and does not necessarily represent the decisions or the stated policy of the World Health Organization. Addendum1 to "The use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances" - WHO/EMP/RHT/TSN/2013.1 1 This addendum is a cumulative list of all new stems selected by the INN Expert Group since the publication of "The use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances" 2013. ------------------------------------------------------------------------------------------------------------ -apt- aptamers, classical and mirror ones (a) avacincaptad pegol (113), egaptivon pegol (111), emapticap pegol (108), lexaptepid pegol (108), olaptesed pegol (109), pegaptanib (88) (b) -vaptan stem: balovaptan (116), conivaptan
    [Show full text]
  • Therapeutic Combination and Use of Dll4 Antagonist Antibodies and Anti-Hypertensive Agents
    (19) TZZ Z_T (11) EP 2 488 204 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: A61K 39/395 (2006.01) A61P 35/00 (2006.01) 06.04.2016 Bulletin 2016/14 A61P 9/12 (2006.01) (21) Application number: 10824244.7 (86) International application number: PCT/US2010/053064 (22) Date of filing: 18.10.2010 (87) International publication number: WO 2011/047383 (21.04.2011 Gazette 2011/16) (54) THERAPEUTIC COMBINATION AND USE OF DLL4 ANTAGONIST ANTIBODIES AND ANTI-HYPERTENSIVE AGENTS THERAPEUTISCHE KOMBINATION UND VERWENDUNGG MIT DLL4-ANTAGONISTISCHE ANTIKÖRPER UND MITTEL GEGEN BLUTHOCHDRUCK COMBINAISON THÉRAPEUTIQUE ET UTILISATION D’ANTICORPS ANTAGONISTES DE D LL4 ET D’AGENTS ANTI-HYPERTENSEURS (84) Designated Contracting States: US-A1- 2009 221 549 AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO • SMITH D C ET AL: "222 A first-in-human, phase I PL PT RO RS SE SI SK SM TR trial of the anti-DLL4 antibody (OMP-21M18) targeting cancer stem cells (CSC) in patients with (30) Priority: 16.10.2009 US 252473 P advanced solid tumors", EUROPEAN JOURNAL OF CANCER. SUPPLEMENT, PERGAMON, (43) Date of publication of application: OXFORD, GB, vol. 8, no. 7, 1 November 2010 22.08.2012 Bulletin 2012/34 (2010-11-01), page 73, XP027497910, ISSN: 1359-6349, DOI: 10.1016/S1359-6349(10)71927-3 (60) Divisional application: [retrieved on 2010-11-01] & Smith et al: "A 16155324.3 first-in-human, phase I trial of the anti-DLL4 antibody (OMP-21M18) targeting cancer stem (73) Proprietor: Oncomed Pharmaceuticals, Inc.
    [Show full text]
  • Stembook 2018.Pdf
    The use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances FORMER DOCUMENT NUMBER: WHO/PHARM S/NOM 15 WHO/EMP/RHT/TSN/2018.1 © World Health Organization 2018 Some rights reserved. This work is available under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 IGO licence (CC BY-NC-SA 3.0 IGO; https://creativecommons.org/licenses/by-nc-sa/3.0/igo). Under the terms of this licence, you may copy, redistribute and adapt the work for non-commercial purposes, provided the work is appropriately cited, as indicated below. In any use of this work, there should be no suggestion that WHO endorses any specific organization, products or services. The use of the WHO logo is not permitted. If you adapt the work, then you must license your work under the same or equivalent Creative Commons licence. If you create a translation of this work, you should add the following disclaimer along with the suggested citation: “This translation was not created by the World Health Organization (WHO). WHO is not responsible for the content or accuracy of this translation. The original English edition shall be the binding and authentic edition”. Any mediation relating to disputes arising under the licence shall be conducted in accordance with the mediation rules of the World Intellectual Property Organization. Suggested citation. The use of stems in the selection of International Nonproprietary Names (INN) for pharmaceutical substances. Geneva: World Health Organization; 2018 (WHO/EMP/RHT/TSN/2018.1). Licence: CC BY-NC-SA 3.0 IGO. Cataloguing-in-Publication (CIP) data.
    [Show full text]
  • Vasopressin Receptors and Drugs: a Brief Perspective
    Global Journal of Pharmacology 8 (1): 80-83, 2014 ISSN 1992-0075 © IDOSI Publications, 2014 DOI: 10.5829/idosi.gjp.2014.8.1.82137 Vasopressin Receptors and Drugs: A Brief Perspective J. Senthilkumaran Jagadeesh, N.S. Muthiah and M. Muniappan Department of Pharmacology, Sree Balaji Medical College and Hospital, Chennai, Tamilnadu, India Abstract: Objective: In the last decade, knowledge of vasopressin receptors has expanded enormously. It is the purpose of this review to present the current status of our knowledge of vasopressin receptor and drugs acting on them. The goal is to provide a brief perspective as a context for our current understanding and to highlight the gaps in our current understanding. From a pharmacological perspective, it should permit the development of very selective drugs with relatively few side effects. Method A comprehensive review of scientific articles published that address vassopressin receptor subtypes, agonist and antagonist was carried out. Results: There are three subtypes of vasopressin receptor V1 (V 1A ), v2 and V3 (V 1B ). vasopressin receptor agonists are found to to be effective in septic shock hypothalamic diabetes insipidus, nocturnal enuresis, some kinds of urinary incontinence, hemophilia, von Willebrand's disease and as antiproliferative. vasopressin receptor agonists are found to to be effective in SIADH, postoperative hyponatremia, CHF, cirrhosis, polycystic kidney disease and Nephrogenic diabetes insipidus. In Conclusions though vasopressin receptor agonists and antagonists have effect on various organs only few drugs are available in the market and certain available drugs use are limited due to adverse effects. This can be overcome by doing further research and devoloping new drugs with fewer side effects.
    [Show full text]
  • Japundzic-Zigon 2019-0023-MS CN
    Send Orders for Reprints to [email protected] 14 Current Neuropharmacology, 2020, 18, 14-33 REVIEW ARTICLE Vasopressin & Oxytocin in Control of the Cardiovascular System: An Updated Review Nina Japundžić-Žigon1,*, Maja Lozić1, Olivera Šarenac1 and David Murphy2 1Faculty of Medicine, University of Belgrade, Belgrade, Serbia; 2School of Clinical Sciences, University of Bristol, Bristol, England Abstract: Since the discovery of vasopressin (VP) and oxytocin (OT) in 1953, considerable knowl- edge has been gathered about their roles in cardiovascular homeostasis. Unraveling VP vasocon- strictor properties and V1a receptors in blood vessels generated powerful hemostatic drugs and A R T I C L E H I S T O R Y drugs effective in the treatment of certain forms of circulatory collapse (shock). Recognition of the key role of VP in water balance via renal V2 receptors gave birth to aquaretic drugs found to be Received: March 15, 2019 Revised: June 03, 2019 useful in advanced stages of congestive heart failure. There are still unexplored actions of VP and Accepted: July 06, 2019 OT on the cardiovascular system, both at the periphery and in the brain that may open new venues in treatment of cardiovascular diseases. After a brief overview on VP, OT and their peripheral ac- DOI: 10.2174/1570159X17666190717150501 tion on the cardiovascular system, this review focuses on newly discovered hypothalamic mecha- nisms involved in neurogenic control of the circulation in stress and disease. Keywords: Vasopressin, oxytocin, blood pressure, heart rate, short-term variability, stress, hypertension, heart failure. 1. INTRODUCTION healing. Furthermore, a cardio-protective potential of OT during cardiac ischemia and diabetes has been suggested.
    [Show full text]
  • WO 2018/226769 Al 13 December 2018 (13.12.2018) W !P O PCT
    (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2018/226769 Al 13 December 2018 (13.12.2018) W !P O PCT (51) International Patent Classification: (81) Designated States (unless otherwise indicated, for every C07D 487/04 (2006.01) A61P 25/24 (2006.01) kind of national protection available): AE, AG, AL, AM, C07D 491/04 (2006.01) A61P 25/18 (2006.01) AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, A61K 31/5517 {2006.01) A61P 9/06 (2006.01) CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, A61K 31/55 (2006.01) A61P 15/10 (2006.01) DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, A61P 25/22 (2006.01) A61P 15/08 (2006.01) HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, A61P 25/20 (2006.01) KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, (21) International Application Number: OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, PCT/US20 18/036 167 SC, SD, SE, SG, SK, SL, SM, ST, SV, SY,TH, TJ, TM, TN, (22) International Filing Date: TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. 05 June 2018 (05.06.2018) (84) Designated States (unless otherwise indicated, for every (25) Filing Language: English kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, (26) Publication Language: English UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, (30) Priority Data: TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, 62/5 15,473 05 June 2017 (05.06.2017) US EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, (71) Applicant: BLACKTHORN THERAPEUTICS, INC.
    [Show full text]
  • Organic & Biomolecular Chemistry
    Organic & Biomolecular Chemistry Accepted Manuscript This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication. Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available. You can find more information about Accepted Manuscripts in the Information for Authors. Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal’s standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains. www.rsc.org/obc Page 1 of 7 OrganicPlease & Biomoleculardo not adjust margins Chemistry Journal Name ARTICLE Enantioselective organocatalyzed aza-Morita −Baylis−Hillman reaction of isatin-derived ketimines with acrolein a a a a b Received 00th January 20xx, Yasushi Yoshida, Makoto Sako, Kenta Kishi, Hiroaki Sasai, Susumi Hatakeyama and Shinobu Manuscript Accepted 00th January 20xx Takizawa* a DOI: 10.1039/x0xx00000x A highly enantioselective aza-Morita−Baylis−Hillman (aza-MBH) reaction of isatin-derived ketimines with acrolein was established using β-isocupreidine (β-ICD) or α-isocupreine (α-ICPN) as a chiral acid-base organocatalyst. The present www.rsc.org/ protocol readily furnished (S) or (R)-aza-MBH adducts with a chiral tetrasubstituted carbon stereogenic center in up to 98% ee.
    [Show full text]
  • The Hitchhiker's Guide to Clinical Pharmacology
    The Hitchhiker’s Guide to Clinical Pharmacology Pharmacodynamics: How Drugs Work J K Aronson Contents 1. The types of pharmacological actions of drugs 1.1. Drug action via a direct effect on a receptor 1.2. Short-term and long-term effects of drugs at receptors 1.3. Soluble receptors 1.4. Drug action via indirect alteration of the effect of an endogenous agonist 1.5. Drug action via inhibition of transport processes 1.6. Drug action via enzyme inhibition 1.7. Drug action via direct enzymatic activity or activation of enzymes 1.8. Drug action via other miscellaneous effects 1.9. Multiplicity of effects 2. Stereoisomerism and drug action 2.1. Pharmacokinetic differences between stereoisomers 2.2. Pharmacodynamic differences between stereoisomers 2.3. Interactions between stereoisomers 2.4. Drug interactions and stereoisomers 2.5. The clinical relevance of stereoisomerism 3. Graded responses to drugs: the dose-response curve in drug therapy Pharmacokinetics is about how drugs move around the body, being absorbed, distributed to their sites of action, and being eliminated. Pharmacodynamics is about all those matters that are concerned with the pharmacological actions of drugs when they get to their sites of action, whether they be determinants of beneficial or adverse effects. 1. The types of pharmacological actions of drugs The different ways in which drugs produce their pharmacological effects are classified in Table 1. Several of the examples I shall illustrate cross the boundaries of this classification. For example, cardiac glycosides can be considered as ligands that act by binding to their receptor (the Na/K-ATPase), as inhibitors of an enzyme (the Na/K-ATPase), or as inhibitors of a transport process (the Na/K pump).
    [Show full text]
  • Regulatory Glucagon Release and Is Diminished in Type 1 Diabetes
    bioRxiv preprint doi: https://doi.org/10.1101/2020.01.30.927426; this version posted August 12, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Arginine-vasopressin mediates counter- 2 regulatory glucagon release and is 3 diminished in type 1 diabetes 4 Angela Kim1,2, Jakob G. Knudsen3,4, Joseph C. Madara1, Anna Benrick5, Thomas Hill3, 5 Lina Abdul Kadir3, Joely A. Kellard3, Lisa Mellander5, Caroline Miranda5, Haopeng 6 Lin6, Timothy James7, Kinga Suba8, Aliya F. Spigelman6, Yanling Wu5, Patrick E. 7 MacDonald6, Ingrid Wernstedt Asterholm5, Tore Magnussen9, Mikkel Christensen9,10,11, 8 Tina Visboll9,10,12, Victoria Salem8, Filip K. Knop9,10,12,13, Patrik Rorsman3,5, Bradford 9 B. Lowell1,2, Linford J.B. Briant3,14,* 10 11 Affiliations 12 1Division of Endocrinology, Diabetes, and Metabolism, Beth Israel Deaconess Medical 13 Center, Boston, MA 02215, USA. 2Program in Neuroscience, Harvard Medical School, 14 Boston, MA 02115, USA. 3Oxford Centre for Diabetes, Endocrinology and Metabolism, 15 Radcliffe Department of Medicine, University of Oxford, Oxford, OX4 7LE, UK. 4Section 16 for Cell Biology and Physiology, Department of Biology, University of Copenhagen. 17 5Institute of Neuroscience and Physiology, Metabolic Research Unit, University of Göteborg, 18 405 30, Göteborg, Sweden. 6Alberta Diabetes Institute, 6-126 Li Ka Shing Centre for Health 19 Research Innovation, Edmonton, Alberta, T6G 2E1, Canada. 7Department of Clinical 20 Biochemistry, John Radcliffe, Oxford NHS Trust, OX3 9DU, Oxford, UK.
    [Show full text]