Long term potentiation varies with layer in rat visual cortex.

X F Wang; N W Daw

doi:10.1016/s0006-8993(03)03321-3

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PubMed · 14519508

Long term potentiation varies with layer in rat visual cortex.

X F Wang·N W Daw

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Abstract

Long term potentiation (LTP) in various layers of rat visual cortex was studied in 90 cells with visually identified, whole-cell recordings. LTP was induced in layer II/III, layer V or layer VI with theta burst stimulation (TBS), but was not observed in layer IV. In the presence of a NMDA antagonist, D-AP5, in the bath solution, potentiation was blocked in layer II/III, some depression was seen in layer V, and potentiation still remained in layer VI. After addition of a specific mGluR1 antagonist, LY367385, to the bath solution, LTP was reduced in layer II/III and layer V, and was blocked in layer VI. After a specific mGluR5 antagonist, MPEP was applied in the bath solution, LTP was enhanced in layer VI, and blocked in layer V. We conclude that: (1) LTP in layer VI is different from other layers, depending on mGluR1, but not NMDA receptors. (2) In layer II/III, LTP is NMDA-dependent and is not blocked by group I mGluR antagonists. (3) LTP in layer V is both NMDA receptor and mGluR5 receptor-dependent. (4) LTP was not induced in layer IV with TBS.

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Animals Excitatory Amino Acid Antagonists Excitatory Postsynaptic Potentials In Vitro Techniques Long-Term Potentiation Rats Receptors, Metabotropic Glutamate Receptors, N-Methyl-D-Aspartate Visual Cortex Journal Article Research Support, U.S. Gov't, P.H.S.

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X F Wang, N W Daw. 2003-10-31. Long term potentiation varies with layer in rat visual cortex.. https://doi.org/10.1016/s0006-8993(03)03321-3

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