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      Everything You Always Wanted to Know about β 3-AR * (* But Were Afraid to Ask)

      review-article
      Author(s): * ,
      Publication date (Electronic):
      Journal: Cells
      Publisher: MDPI
      Keywords: beta-3 adrenergic receptor, therapeutic target, G-protein coupled receptors

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          Abstract

          The beta-3 adrenergic receptor (β 3-AR) is by far the least studied isotype of the beta-adrenergic sub-family. Despite its study being long hampered by the lack of suitable animal and cellular models and inter-species differences, a substantial body of literature on the subject has built up in the last three decades and the physiology of β 3-AR is unraveling quickly. As will become evident in this work, β 3-AR is emerging as an appealing target for novel pharmacological approaches in several clinical areas involving metabolic, cardiovascular, urinary, and ocular disease. In this review, we will discuss the most recent advances regarding β 3-AR signaling and function and summarize how these findings translate, or may do so, into current clinical practice highlighting β 3-AR’s great potential as a novel therapeutic target in a wide range of human conditions.

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          Role of serotonergic and noradrenergic systems in the pathophysiology of depression and anxiety disorders.

          K J Ressler, C B Nemeroff (2000)
          There is abundant evidence for abnormalities of the norepinephrine (NE) and serotonin (5HT) neurotransmitter systems in depression and anxiety disorders. The majority of evidence supports underactivation of serotonergic function and complex dysregulation of noradrenergic function, most consistent with overactivation of this system. Treatment for these disorders requires perturbation of these systems. Reproducible increases in serotonergic function and decreases in noradrenergic function accompany treatment with antidepressants, and these alterations may be necessary for antidepressant efficacy. Dysregulation of these systems clearly mediates many symptoms of depression and anxiety. The underlying causes of these disorders, however, are less likely to be found within the NE and 5HT systems, per se. Rather their dysfunction is likely due to their role in modulating, and being modulated by, other neurobiologic systems that together mediate the symptoms of affective illness. Clarification of noradrenergic and serotonergic modulation of various brain regions may yield a greater understanding of specific symptomatology, as well as the underlying circuitry involved in euthymic and abnormal mood and anxiety states. Disrupted cortical regulation may mediate impaired concentration and memory, together with uncontrollable worry. Hypothalamic abnormalities likely contribute to altered appetite, libido, and autonomic symptoms. Thalamic and brainstem dysregulation contributes to altered sleep and arousal states. Finally, abnormal modulation of cortical-hippocampal-amygdala pathways may contribute to chronically hypersensitive stress and fear responses, possibly mediating features of anxiety, anhedonia, aggression, and affective dyscontrol. The continued appreciation of the neural circuitry mediating affective states and their modulation by neurotransmitter systems should further the understanding of the pathophysiology of affective and anxiety disorders.
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            The selectivity of beta-adrenoceptor antagonists at the human beta1, beta2 and beta3 adrenoceptors.

            Michael G Baker (2005)
            Beta-adrenoceptor antagonists ("beta-blockers") are one of the most widely used classes of drugs in cardiovascular medicine (hypertension, ischaemic heart disease and increasingly in heart failure) as well as in the management of anxiety, migraine and glaucoma. Where known, the mode of action in cardiovascular disease is from antagonism of endogenous catecholamine responses in the heart (mainly at beta1-adrenoceptors), while the worrisome side effects of bronchospasm result from airway beta2-adrenoceptor blockade. The aim of this study was to determine the selectivity of beta-antagonists for the human beta-adrenoceptor subtypes. (3)H-CGP 12177 whole cell-binding studies were undertaken in CHO cell lines stably expressing either the human beta1-, beta2- or the beta3-adrenoceptor in order to determine the affinity of ligands for each receptor subtype in the same cell background. In this study, the selectivity of well-known subtype-selective ligands was clearly demonstrated: thus, the selective beta1 antagonist CGP 20712A was 501-fold selective over beta2 and 4169-fold selective over beta3; the beta2-selective antagonist ICI 118551 was 550- and 661-fold selective over beta1 and beta3, respectively, and the selective beta3 compound CL 316243 was 10-fold selective over beta2 and more than 129-fold selective over beta1. Those beta2-adrenoceptor agonists used clinically for the treatment of asthma and COPD were beta2 selective: 29-, 61- and 2818-fold for salbutamol, terbutaline and salmeterol over beta1, respectively. There was little difference in the affinity of these ligands between beta1 and beta3 adrenoceptors. The clinically used beta-antagonists studied ranged from bisoprolol (14-fold beta1-selective) to timolol (26-fold beta2-selective). However, the majority showed little selectivity for the beta1- over the beta2-adrenoceptor, with many actually being more beta2-selective. This study shows that the beta1/beta2 selectivity of most clinically used beta-blockers is poor in intact cells, and that some compounds that are traditionally classed as "beta1-selective" actually have higher affinity for the beta2-adrenoceptor. There is therefore considerable potential for developing more selective beta-antagonists for clinical use and thereby reducing the side-effect profile of beta-blockers.
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              Role of beta-adrenoceptor signaling in skeletal muscle: implications for muscle wasting and disease.

              James Ryall, James G. Ryall (2008)
              The importance of beta-adrenergic signaling in the heart has been well documented, but it is only more recently that we have begun to understand the importance of this signaling pathway in skeletal muscle. There is considerable evidence regarding the stimulation of the beta-adrenergic system with beta-adrenoceptor agonists (beta-agonists). Although traditionally used for treating bronchospasm, it became apparent that some beta-agonists could increase skeletal muscle mass and decrease body fat. These so-called "repartitioning effects" proved desirable for the livestock industry trying to improve feed efficiency and meat quality. Studying beta-agonist effects on skeletal muscle has identified potential therapeutic applications for muscle wasting conditions such as sarcopenia, cancer cachexia, denervation, and neuromuscular diseases, aiming to attenuate (or potentially reverse) the muscle wasting and associated muscle weakness, and to enhance muscle growth and repair after injury. Some undesirable cardiovascular side effects of beta-agonists have so far limited their therapeutic potential. This review describes the physiological significance of beta-adrenergic signaling in skeletal muscle and examines the effects of beta-agonists on skeletal muscle structure and function. In addition, we examine the proposed beneficial effects of beta-agonist administration on skeletal muscle along with some of the less desirable cardiovascular effects. Understanding beta-adrenergic signaling in skeletal muscle is important for identifying new therapeutic targets and identifying novel approaches to attenuate the muscle wasting concomitant with many diseases.
              Article 0 comments Cited 136 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Cells
                Journal ID (iso-abbrev): Cells
                Journal ID (publisher-id): cells
                Title: Cells
                Publisher: MDPI
                ISSN (Electronic): 2073-4409
                Publication date (Electronic): 16 April 2019
                Publication date Collection: April 2019
                Volume: 8
                Issue: 4
                Electronic Location Identifier: 357
                Affiliations
                Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06510, USA; michael.caplan@ 123456yale.edu
                Author notes
                [* ]Correspondence: giorgia.schena@ 123456yale.edu ; Tel.: +1-203-785-6833
                Author information
                https://orcid.org/0000-0001-5504-4834
                Article
                Publisher ID: cells-08-00357
                DOI: 10.3390/cells8040357
                PMC ID: 6523418
                PubMed ID: 30995798
                SO-VID: fe626fc8-f593-480b-9fda-afece39f284c
                Copyright © © 2019 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 19 February 2019
                Date accepted : 12 April 2019
                Categories
                Subject: Review

                Keywords: beta-3 adrenergic receptor,therapeutic target,g-protein coupled receptors
                Data availability:
                Keywords: beta-3 adrenergic receptor, therapeutic target, g-protein coupled receptors

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