Differential interaction of platelet-activating factor and NMDA receptor function in hippocampal and dorsal striatal memory processes.
The interaction between platelet activating factor (PAF) and NMDA receptor function in hippocampal and dorsal striatal memory processes was examined. In both a hidden and a visible platform water maze task, peripheral post-training injection of MK-801 (0.05 mg/kg) impaired memory. Post-training intrahippocampal infusions of PAF (1.0 microg/0.5 microl) enhanced memory in the hidden platform task, while intradorsal striatal infusion of PAF (1.0 microg/0.5 microl) enhanced memory in the visible platform task. The memory impairing effects of post-training injection of MK-801 was blocked by concurrent intrahippocampal infusion of PAF. In contrast, post-training injection of MK-801 blocked the memory enhancing effects of concurrent intradorsal striatal infusion of PAF. The results suggest that (1) the memory enhancing effects of intracerebral PAF infusion involve an interaction with NMDA receptor function, and (2) the nature of this interaction may represent a differential mechanism mediating the distinct roles of the hippocampus and dorsal striatum in cognitive memory and stimulus-response habit formation, respectively.
Teather
L A
LA
Neuroscience Center of Excellence, Louisiana State University Medical Center, New Orleans, USA.
Packard
M G
MG
Bazan
N G
NG
D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D002421:Caudate Nucleus / Q000187:drug effects; D003342:Corpus Striatum / Q000187:drug effects*; D016291:Dizocilpine Maleate / Q000008:administration & dosage / Q000009:adverse effects / Q000037:antagonists & inhibitors; D018691:Excitatory Amino Acid Antagonists / Q000008:administration & dosage / Q000009:adverse effects / Q000378:metabolism; D006624:Hippocampus / Q000187:drug effects*; D007267:Injections; D008297:Male; D008568:Memory / Q000187:drug effects*; D010972:Platelet Activating Factor / Q000008:administration & dosage / Q000494:pharmacology*; D011897:Random Allocation; D051381:Rats; D020318:Rats, Long-Evans; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects*; D014796:Visual Perception / Q000187:drug effects
D018691:Excitatory Amino Acid Antagonists; D010972:Platelet Activating Factor; D016194:Receptors, N-Methyl-D-Aspartate; D016291:Dizocilpine Maleate