Endogenous glutamatergic synaptic activity elicits acetylcholine release from rat cultured septal cells.
We tested the characteristics of acetylcholine (ACh) release from cultured rat septal cells. The spontaneous release was inhibited by treatment with tetrodotoxin (TTX) and omega-conotoxin (GVIA), indicating that the release was elicited by synaptic activity. The release was also inhibited by 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX), an alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptor blocker, in both the absence and presence of nerve growth factor (NGF), suggesting that endogenously released glutamate produced the ACh release by stimulating AMPA receptors. This is the first report of detection of the release of ACh by endogenous spontaneous synaptic activity conducted by glutamate AMPA receptor activation in cultured septal cells. This in vitro experimental system is useful for the study of cholinergic functions.
Department of Pharmacology, Kyoritsu College of Pharmacy, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan. suzuki-tk@kyoritsu-ph.ac.jp
Takeshi
T
Suzuki
Takeshi
T
Matsugi
Ryoichi
R
Takagi
Koichiro
K
Kawashima
D000109:Acetylcholine / Q000378:metabolism*; D000818:Animals; D002478:Cells, Cultured; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D018698:Glutamic Acid / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D018091:Receptors, AMPA / Q000037:antagonists & inhibitors / Q000378:metabolism; D020665:Septum of Brain / Q000187:drug effects / Q000378:metabolism*; D013569:Synapses / Q000187:drug effects / Q000378:metabolism*
D018691:Excitatory Amino Acid Antagonists; D018091:Receptors, AMPA; D018698:Glutamic Acid; D000109:Acetylcholine