Molecular cloning, functional expression, pharmacological characterization and chromosomal localization of the human metabotropic glutamate receptor type 3.

Abstract:

:Glutamic acid is the major excitatory amino acid of the central nervous system which interacts with two receptor families, the ionotropic and metabotropic glutamate receptors. The metabotropic glutamate receptors (mGluRs) are coupled to G proteins and can be divided into three subgroups based on their sequence homology, signal transduction pathway and pharmacology. In this study, we describe the cloning of the cDNA encoding the human metabotropic glutamate receptor type 3 (HmGluR3). It was obtained by reverse transcription-polymerase chain reaction (RT-PCR) with degenerate oligonucleotides corresponding to highly conserved sequences between rat mGluRs. The receptor shows 879 amino acids with 96% amino acid sequence identity with rat mGluR3. It is strongly expressed in fetal and adult whole brain, especially in caudate nucleus and corpus callosum. The gene was identified by fluorescence in situ hybridization on chromosome 7 band q22. Activation of the human mGluR3, permanently expressed in Baby Hamster Kidney (BHK) cells, by excitatory amino acid inhibits the forskolin-stimulated accumulation of intracellular cAMP. The rank order of potency is L-glutamic acid > or = (1S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid (1S,3R)-ACPD) > ibotenic acid > quisqualic acid. (RS)-alpha-methyl-4-carboxyphenylglycine [(RS)-MCPG, 1 mM] is without effect on inhibition of forskolin-induced cAMP accumulation by L-glutamic acid.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Emile L,Mercken L,Apiou F,Pradier L,Bock MD,Menager J,Clot J,Doble A,Blanchard JC

doi

10.1016/0028-3908(96)84622-3

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

523-30

issue

5

eissn

0028-3908

issn

1873-7064

pii

0028390896846223

journal_volume

35

pub_type

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