5-HT(1A) receptor sensitivity in 5-HT(1B) receptor KO mice is unaffected by chronic fluvoxamine treatment. 2011

Christiaan H Vinkers, and Lucianne Groenink, and Tommy Pattij, and Berend Olivier, and J Adriaan Bouwknecht
Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences and Rudolf Magnus Institute of Neuroscience, Utrecht University, Utrecht, The Netherlands. c.h.vinkers@uu.nl

The 5-HT(1B) receptor has been implicated in disorders such as depression, anxiety and obsessive-compulsive disorder. In mice lacking the 5-HT(1B) receptor (5-HT(1B) knockout mice), important changes in physiology and behavior exist. In the absence of presynaptic 5-HT(1B) receptor inhibition, chronic SSRI treatment may differentially affect 5-HT(1A) receptor functionality. The present studies tested the hypothesis that chronically reducing 5-HT transporter (5-HTT) function with selective serotonin reuptake inhibitor (SSRI) treatment would accelerate 5-HT(1A) receptor desensitization in 5-HT(1B) knockout mice. Moreover, as 5-HT(1B) knockout mice have been found to display exaggerated autonomic and locomotor responses to environmental stressors, the effects of chronic SSRI treatment on the hyperreactive phenotype of 5-HT(1B) knockout mice were investigated. The stress-reducing effect of the 5-HT(1A) receptor agonist flesinoxan on increases in body temperature, heart rate and locomotor activity was similar in wild type and 5-HT(1B) knockout mice before and after chronic 21-day treatment with the SSRI fluvoxamine, indicating no apparent alteration of 5-HT(1A) receptor sensitivity in 5-HT(1B) knockout mice. Also, chronic SSRI treatment did not alter the increased stress reactivity to mild environmental stressors in 5-HT(1B) knockout mice. We demonstrate that no apparent differences in 5-HT(1A) receptor sensitivity occur between 5-HT(1B) knockout and wild type mice after chronic fluvoxamine treatment. Also, the hyperreactive phenotype of 5-HT(1B) knockout mice is unresponsive to chronic SSRI treatment. Taken together, these results indicate that constitutive absence of 5-HT(1B) receptors does not result in adaptive changes in 5-HT(1A) receptor functionality and that chronic SSRI treatment does not modify stress reactivity in 5-HT(1B) knockout mice.

UI MeSH Term Description Entries
D008297 Male Males
D009043 Motor Activity Body movements of a human or an animal as a behavioral phenomenon. Activities, Motor,Activity, Motor,Motor Activities
D001831 Body Temperature The measure of the level of heat of a human or animal. Organ Temperature,Body Temperatures,Organ Temperatures,Temperature, Body,Temperature, Organ,Temperatures, Body,Temperatures, Organ
D006339 Heart Rate The number of times the HEART VENTRICLES contract per unit of time, usually per minute. Cardiac Rate,Chronotropism, Cardiac,Heart Rate Control,Heartbeat,Pulse Rate,Cardiac Chronotropy,Cardiac Chronotropism,Cardiac Rates,Chronotropy, Cardiac,Control, Heart Rate,Heart Rates,Heartbeats,Pulse Rates,Rate Control, Heart,Rate, Cardiac,Rate, Heart,Rate, Pulse
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013312 Stress, Physiological The unfavorable effect of environmental factors (stressors) on the physiological functions of an organism. Prolonged unresolved physiological stress can affect HOMEOSTASIS of the organism, and may lead to damaging or pathological conditions. Biotic Stress,Metabolic Stress,Physiological Stress,Abiotic Stress,Abiotic Stress Reaction,Abiotic Stress Response,Biological Stress,Metabolic Stress Response,Physiological Stress Reaction,Physiological Stress Reactivity,Physiological Stress Response,Abiotic Stress Reactions,Abiotic Stress Responses,Abiotic Stresses,Biological Stresses,Biotic Stresses,Metabolic Stress Responses,Metabolic Stresses,Physiological Stress Reactions,Physiological Stress Responses,Physiological Stresses,Reaction, Abiotic Stress,Reactions, Abiotic Stress,Response, Abiotic Stress,Response, Metabolic Stress,Stress Reaction, Physiological,Stress Response, Metabolic,Stress Response, Physiological,Stress, Abiotic,Stress, Biological,Stress, Biotic,Stress, Metabolic
D013997 Time Factors Elements of limited time intervals, contributing to particular results or situations. Time Series,Factor, Time,Time Factor
D016666 Fluvoxamine A selective serotonin reuptake inhibitor that is used in the treatment of DEPRESSION and a variety of ANXIETY DISORDERS. DU-23000,Desiflu,Dumirox,Faverin,Fevarin,Floxyfral,Fluvoxadura,Fluvoxamin AL,Fluvoxamin Stada,Fluvoxamin beta,Fluvoxamin-neuraxpharm,Fluvoxamin-ratiopharm,Fluvoxamina Geminis,Fluvoxamine Maleate,Fluvoxamine Maleate, (E)-Isomer,Fluvoxamine, (Z)-Isomer,Luvox,Novo-Fluvoxamine,Nu-Fluvoxamine,PMS-Fluvoxamine,ratio-Fluvoxamine,DU 23000,DU23000,Fluvoxamin neuraxpharm,Fluvoxamin ratiopharm,Geminis, Fluvoxamina,Novo Fluvoxamine,Nu Fluvoxamine,PMS Fluvoxamine,ratio Fluvoxamine
D017367 Selective Serotonin Reuptake Inhibitors Compounds that specifically inhibit the reuptake of serotonin in the brain. 5-HT Uptake Inhibitor,5-HT Uptake Inhibitors,5-Hydroxytryptamine Uptake Inhibitor,5-Hydroxytryptamine Uptake Inhibitors,SSRIs,Selective Serotonin Reuptake Inhibitor,Serotonin Reuptake Inhibitor,Serotonin Reuptake Inhibitors,Serotonin Uptake Inhibitor,Serotonin Uptake Inhibitors,Inhibitors, 5-HT Uptake,Inhibitors, 5-Hydroxytryptamine Uptake,Inhibitors, Serotonin Reuptake,Inhibitors, Serotonin Uptake,Reuptake Inhibitors, Serotonin,Uptake Inhibitors, 5-HT,Uptake Inhibitors, 5-Hydroxytryptamine,Uptake Inhibitors, Serotonin,Inhibitor, 5-HT Uptake,Inhibitor, 5-Hydroxytryptamine Uptake,Inhibitor, Serotonin Reuptake,Inhibitor, Serotonin Uptake,Reuptake Inhibitor, Serotonin,Uptake Inhibitor, 5-HT,Uptake Inhibitor, 5-Hydroxytryptamine,Uptake Inhibitor, Serotonin
D044282 Receptor, Serotonin, 5-HT1A A serotonin receptor subtype found distributed through the CENTRAL NERVOUS SYSTEM where they are involved in neuroendocrine regulation of ACTH secretion. The fact that this serotonin receptor subtype is particularly sensitive to SEROTONIN RECEPTOR AGONISTS such as BUSPIRONE suggests its role in the modulation of ANXIETY and DEPRESSION. Serotonin 1A Receptor,5-HT(1A) Receptor,5-HT1A Receptor,5-Hydroxytryptamine 1A Receptor,5-Hydroxytryptamine 1A Receptors,Receptor, 5-Hydroxytryptamine 1A,Serotonin Receptor, 5-HT1A,Serotonin, 5-HT1a Receptor,1A Receptor, 5-Hydroxytryptamine,1A Receptors, 5-Hydroxytryptamine,5 HT1A Receptor,5 Hydroxytryptamine 1A Receptor,5 Hydroxytryptamine 1A Receptors,5-HT1A Serotonin Receptor,5-HT1a Receptor Serotonin,Receptor Serotonin, 5-HT1a,Receptor, 5 Hydroxytryptamine 1A,Receptor, 5-HT1A,Receptor, 5-HT1A Serotonin,Receptor, Serotonin 1A,Receptors, 5-Hydroxytryptamine 1A,Serotonin Receptor, 5 HT1A,Serotonin, 5 HT1a Receptor

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