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Vol. 51, Issue 3, 533-591, September 1999

Autoregulation of Serotonin Neurons: Role in Antidepressant Drug Action

Graciela Piñeyro and Pierre Blier1

Department of Psychiatry, Neurobiological Psychiatry Unit, McGill University, Montreal, Quebec, Canada

I. Introduction
II. Morphological Aspects of the 5-HT Rostral System
    A. 5-HT Nuclei
        1. The Caudal Linear Nucleus.
        2. The Dorsal Raphe Nucleus.
        3. The Median Raphe Nucleus.
        4. The Supralemniscal Region.
    B. Ultrastructure
        1. Sources of Extracellular 5-HT in Rostral Raphe Nuclei
        2. Cell Bodies Found in the 5-HT Nuclei.
    C. Afferents to Midbrain 5-HT Nuclei
    D. Efferent Pathways and Terminal Projection Areas
        1. Efferent Pathways.
        2. Terminal Projection Areas.
III. Physiological and Pharmacological Aspects of the 5-HT System
    A. Firing Activity of 5-HT Neurons
        1. Autoregulation of 5-HT Neuron Firing Activity.
        2. Role of Non-5-HT Receptors in the Regulation of 5-HT Neuron Firing Activity.
        3. Heteroregulation of 5-HT Neuron Firing Activity.
    B. Effect of Antidepressant Drug Administration on 5-HT Neuron Firing Activity
    C. 5-HT Release
        1. Neurotransmitter Release and Its Regulation: Cellular and Molecular Aspects.
        2. Physiological Role of Extracellular 5-HT Bioavailability in Midbrain Raphe Nuclei.
        3. Autoregulation of 5-HT Release in the Raphe Nuclei.
        4. Heteroregulation of Neurotransmitter Release in Midbrain Raphe Nuclei.
        5. Autoregulation of 5-HT Release in Terminal Projection Areas: Cortex and Hippocampus.
        6. Heteroregulation of Neurotransmitter Release from 5-HT Fibers in Cortex and Hippocampus.
        7. 5-HT1B versus 5-HT1D Receptors.
    D. Effect of Antidepressant Drug Administration on 5-HT Release
        1. Administration of 5-HT Reuptake Blockers.
        2. Prolonged Administration of MAOIs.
        3. Antidepressants with alpha 2 Adrenoceptor Antagonistic Properties.
        4. Activation of 5-HT1A Receptors by 5-HT1A Agonists.
    E. 5-HT Reuptake
        1. Molecular Characteristics of the 5-HT Transporter (SERT).
        2. The Mechanism of 5-HT Uptake.
        3. Anatomical and Cellular Localization of the SERT.
        4. Pharmacological Properties of the SERT.
        5. Tianeptine, a Class by Itself?
    F. Regulation of 5-HT Uptake Activity by Antidepressant Drugs
IV. Concluding Remarks
Acknowledgments
References


1   Address for correspondence: Pierre Blier, Department of Psychiatry, Neurobiological Psychiatry Unit, 1033 Pine Ave. West, H3A 1A1 Quebec, Canada. E-mail: pierreblier{at}compuserve.com


0031-6997/99/5103-0533$03.00/0
PHARMACOLOGICAL REVIEWS
Copyright © 1999 by The American Society for Pharmacology and Experimental Therapeutics



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