Functional expression of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors precedes the development of cholinergic phenotype in embryonic rat septal cells in culture.
We examined the development of cholinergic neuronal functions and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) responses in cultured embryonic rat septal cells. Choline acetyltransferase activity was increased from 4 to 6 days in culture and reached a plateau at day 8. Acetylcholine release was increased from 6 to 8 days in culture. AMPA-induced increase in intracellular Ca(2+) level was observed at 3 days in culture and most of the AMPA-responsive cells coincided with high-K(+) responsive cells. These results suggest that cholinergic neurons develop their neuronal functions about 8 days under cultured conditions, and functional expression of AMPA receptors precedes the cholinergic functional development.
Suzuki
T
T
Department of Pharmacology, Kyoritsu College of pharmacy, 1-5-30 Shibakoen, Minatoku, 105-8512, Tokyo, Japan. suzuki-tk@kyoritsu-ph.ac.jp
Matsugi
T
T
Takagi
R
R
Kanagawa
M
M
Hirata
M
M
Nakamura
T
T
Kudo
Y
Y
Kawashima
K
K
D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002478:Cells, Cultured; D002795:Choline O-Acetyltransferase / Q000378:metabolism; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology; D005333:Fetus / Q000166:cytology; D009474:Neurons / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D010641:Phenotype; D011188:Potassium / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D018091:Receptors, AMPA / Q000378:metabolism*; D020665:Septum of Brain / Q000166:cytology*; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / Q000494:pharmacology
D018690:Excitatory Amino Acid Agonists; D018091:Receptors, AMPA; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; D002795:Choline O-Acetyltransferase; D000109:Acetylcholine; D011188:Potassium; D002118:Calcium