Block of HFS-induced LTP in the dentate gyrus by 1S,3S-ACPD: further evidence against LTP as a model for learning.
We have previously shown that block of high-frequency stimulation (HFS) induced long-term potentiation (LTP) of synaptic transmission in area CA1 by (1S,3S)-1-aminocyclopentane-1,3-dicarboxylic acid (1S,3S-ACPD; 5 microliters of a 20 mM solution), an agonist at group II metabotropic glutamate receptors, did not prevent animals from learning a spatial task. Here we show that the same dose of 1S,3S-ACPD also blocked the induction of HFS-induced LTP of the slope of the excitatory postsynaptic potential and of the amplitude of the population spike in the dentate gyrus. We conclude that HFS-induced LTP in the dentate gyrus is not a good model for memory formation.
Hölscher
C
C
Department of Pharmacology, Trinity College, Dublin, Republic of Ireland.
Anwyl
R
R
Rowan
M
M
D000818:Animals; D003515:Cycloleucine / Q000031:analogs & derivatives* / Q000494:pharmacology; D018891:Dentate Gyrus / Q000187:drug effects*; D007858:Learning / Q000502:physiology*; D017774:Long-Term Potentiation / Q000187:drug effects*; D008297:Male; D008959:Models, Neurological; D018696:Neuroprotective Agents / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar
D018696:Neuroprotective Agents; D003515:Cycloleucine; C036361:1-amino-1,3-dicarboxycyclopentane