Abstract
The effects of hypothyroidism on 5-HTIA and 5-HT2A receptors and the serotonin transporter protein were studied in thyroidectomized male Wistar rats in two experimental groups: 1) animals kept on an iodine-free diet hypothyroid rats) and 2) animals kept on thyroxine (15 microg/kg) for 21 days (giving normal thyroid hormone levels. euthyroid animals). Sham-operated rats served as controls. Binding of [3H]8-OH-DPAT with 5-HTIA receptors and [3H]citalopram with the transporter protein in the hippocampus and midbrain showed no changes in hypothyroid rats as compared with controls. Conversely. there were significant decreases in [3H]ketanserin binding to 5-HT2A receptors in the frontal cortex in hypothyroid rats as compared with controls; this decrease was reversed by thyroxine treatment. Thus, losses of cortical 5-HT2A receptors appears to be the main consequence of hypothyroidism at the level of the serotonin system of the brain.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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8-Hydroxy-2-(di-n-propylamino)tetralin / metabolism
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Animals
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Brain Chemistry / physiology*
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Carrier Proteins / metabolism*
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Citalopram / metabolism
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Excitatory Postsynaptic Potentials / physiology
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Hippocampus / metabolism
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Hippocampus / physiology
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Hypothyroidism / metabolism*
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Indicators and Reagents
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Ketanserin / metabolism
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Male
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Membrane Glycoproteins / metabolism*
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Membrane Transport Proteins*
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Mesencephalon / metabolism
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Mesencephalon / physiology
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Nerve Tissue Proteins*
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Radioligand Assay
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Rats
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Rats, Wistar
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Receptor, Serotonin, 5-HT2A
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Receptors, Serotonin / physiology*
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Receptors, Serotonin, 5-HT1
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Serotonin Antagonists / metabolism
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Serotonin Plasma Membrane Transport Proteins
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Thyroidectomy
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Thyroxine / blood
Substances
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Carrier Proteins
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Indicators and Reagents
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Membrane Glycoproteins
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Membrane Transport Proteins
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Nerve Tissue Proteins
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Receptor, Serotonin, 5-HT2A
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Receptors, Serotonin
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Receptors, Serotonin, 5-HT1
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Serotonin Antagonists
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Serotonin Plasma Membrane Transport Proteins
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Slc6a4 protein, rat
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Citalopram
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8-Hydroxy-2-(di-n-propylamino)tetralin
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Ketanserin
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Thyroxine