Abstract
Ferrets (Mustela putorius furo) are useful animals for determining anti-emetic activity via 5-HT(3) receptors in vivo. We isolated a cDNA encoding the 5-hydroxytryptamine (5-HT) type 3A receptor subunit (5-HT(3A)) from ferret colon, expressed it in a human embryonic kidney cell line and determined its pharmacological properties. The open reading frame of the isolated cDNA encoded a 483-amino acid protein, corresponding to the shorter splice variant of 5-HT(3A) receptors. Splice variants were no longer detected by reverse transcriptase-polymerase chain reaction. The ferret 5-HT(3A) receptor exhibits a high degree of amino acid sequence identity (>/=80%) to that of other species. Binding studies demonstrated the following rank order of potency for agonists: meta-chlorophenylbiguanide (mCPBG)>2-methyl-5-hydroxytryptamine (2-Me-5-HT)=5-HT, and for antagonists: ondansetron=tropisetron>(+)-tubocurarine>metoclopramide. Electrophysiological studies revealed that mCPBG was a partial agonist and 2-Me-5-HT was an almost fully effective agonist compared to 5-HT.
MeSH terms
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Alternative Splicing
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Amino Acid Sequence
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Animals
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Biguanides / pharmacology
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Binding, Competitive
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Cell Line
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Cloning, Molecular
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DNA, Complementary / chemistry
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DNA, Complementary / genetics
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Dose-Response Relationship, Drug
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Electrophysiology
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Ferrets
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Gene Expression
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Humans
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Imidazoles / metabolism
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Indoles / metabolism
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Kruppel-Like Factor 6
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Kruppel-Like Transcription Factors
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Membrane Potentials / drug effects
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Molecular Sequence Data
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Ondansetron / pharmacology
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Piperazines
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Proto-Oncogene Proteins*
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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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Radioligand Assay
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Rats
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Receptors, Serotonin / genetics*
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Receptors, Serotonin, 5-HT3
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Sequence Analysis, DNA
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Sequence Homology, Amino Acid
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Serotonin / analogs & derivatives*
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Serotonin / pharmacology
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Serotonin Antagonists / pharmacology
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Serotonin Receptor Agonists / pharmacology
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Tissue Distribution
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Trans-Activators
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Tritium
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Tubocurarine / pharmacology
Substances
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Biguanides
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DNA, Complementary
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Imidazoles
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Indoles
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KLF6 protein, human
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Klf6 protein, rat
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Kruppel-Like Factor 6
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Kruppel-Like Transcription Factors
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Piperazines
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Proto-Oncogene Proteins
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RNA, Messenger
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Receptors, Serotonin
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Receptors, Serotonin, 5-HT3
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Serotonin Antagonists
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Serotonin Receptor Agonists
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Trans-Activators
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Tritium
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GR 65630
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Serotonin
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Ondansetron
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2-methyl-5-HT
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1-(3-chlorophenyl)biguanide
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1-(3-chlorophenyl)piperazine
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Tubocurarine