Bi-directional plasticity and age-dependent long-term depression at mouse CA3-CA1 hippocampal synapses.
Low-frequency stimulation (LFS) is used to induce long-term depression (LTD) and depotentiation at rodent CA3-CA1 hippocampal synapses. The relationship between the efficacy of LFS induction and postnatal age remains to be clearly defined in rat and had not been studied in mouse. The data presented here show that in acute mouse hippocampal slices LFS-induced LTD and depotentiation at CA3-CA1 synapses are: synapse specific; NMDA receptor-dependent; and metabotropic glutamate (mGlu) receptor type I/II independent. Furthermore LFS-induced LTD is highly age-dependent whilst long-term potentiation (LTP) and depotentiation are not. In slices from very young mice (P6-9) LFS induced a robust and stable LTD (-31.1 +/- 5.9%, n = 8, P < 0.01) of CA1 field excitatory post-synaptic potentials (fEPSPs), measured 55-60 min after conditioning. LFS also induced LTD in slices from mice aged P10-13 and P14-17 (-16.0 +/- 3.0%, n = 35, P < 0.001 and -17.9 +/- 5.5%, n = 12, P < 0.01, respectively). However, LTD was not expressed in slices from animals aged P18-21 ( -7.0 +/- 4.1%, n = 16, P > 0.05) or older.
OU Centre for Biomedical Research, Department of Biological Science, Open University, Walton Hall, Milton Keynes MK7 6AA, UK.
Austen J
AJ
Milner
Damian M
DM
Cummings
Jonathan P
JP
Spencer
Kerry P S J
KP
Murphy
D000367:Age Factors; D000375:Aging / Q000502:physiology*; D000704:Analysis of Variance; D000818:Animals; D000831:Animals, Newborn; D004305:Dose-Response Relationship, Drug; D004558:Electric Stimulation / Q000379:methods; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology / Q000528:radiation effects; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006624:Hippocampus / Q000166:cytology*; D066298:In Vitro Techniques; D036881:Long-Term Synaptic Depression / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D051379:Mice; D008810:Mice, Inbred C57BL; D013569:Synapses / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D014633:Valine / Q000031:analogs & derivatives* / Q000494:pharmacology
D018690:Excitatory Amino Acid Agonists; D018691:Excitatory Amino Acid Antagonists; C474696:methyl-(4-carboxyphenyl)glycine; C056639:2-amino-5-phosphopentanoic acid; D014633:Valine; D005998:Glycine