3,5-Dihydroxyphenyl-glycine: a potent agonist of metabotropic glutamate receptors.
An amino acid, 3,5-dihydroxyphenylglycine (DHPG) induced current responses in Xenopus oocytes expressing a metabotropic glutamate receptor clone mGluR1. Apparent EC50 of DHPG for mGluR1 was slightly lower than that of (+-)-1-aminocyclopentane-trans-1,3-dicarboxylic acid (ACPD). DHPG responses were partially inhibited by 2-amino-3-phosphonopropionic acid (AP-3). DHPG had no effect on ionotropic glutamate receptors whose expression was induced in the oocytes following injection of poly(A)+ mRNA of rat brains. In hippocampal slices, DHPG produced slow excitation of pyramidal cells, resulting from a depression of Ca(2+)-dependent K+ current and a voltage-dependent K+ current. These results indicate that DHPG is a specific and potent agonist of mGluRs.
Department of Biology, Faculty of Science, Kyushu University, Fukuoka, Japan.
I
I
Ito
A
A
Kohda
S
S
Tanabe
E
E
Hirose
M
M
Hayashi
S
S
Mitsunaga
H
H
Sugiyama
D015763:2-Amino-5-phosphonovalerate / Q000494:pharmacology; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; D000409:Alanine / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D003515:Cycloleucine / Q000031:analogs & derivatives / Q000494:pharmacology; D004533:Egtazic Acid / Q000494:pharmacology; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism; D066298:In Vitro Techniques; D008297:Male; D009865:Oocytes / Q000187:drug effects / Q000378:metabolism; D015221:Potassium Channels / Q000187:drug effects; D011810:Quinoxalines / Q000494:pharmacology; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D017208:Rats, Wistar; D017470:Receptors, Glutamate / Q000187:drug effects*; D012118:Resorcinols / Q000494:pharmacology*; D014981:Xenopus
D015221:Potassium Channels; D011810:Quinoxalines; D012333:RNA, Messenger; D017470:Receptors, Glutamate; D012118:Resorcinols; C000211:2-amino-3-phosphonopropionic acid; D003515:Cycloleucine; C036361:1-amino-1,3-dicarboxycyclopentane; D004533:Egtazic Acid; C079215:3,5-dihydroxyphenylglycine; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; D015763:2-Amino-5-phosphonovalerate; D000409:Alanine; D005998:Glycine