PKA drives an increase in AMPA receptor unitary conductance during LTP in the hippocampus.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33462202.
- Also identified by DOI 10.1038/s41467-020-20523-3 and PMC identifier 7814032.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Long-term potentiation (LTP) at hippocampal CA1 synapses can be expressed by an increase either in the number (N) of AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid) receptors or in their single channel conductance (γ). Here, we have established how these distinct synaptic processes contribute to the expression of LTP in hippocampal slices obtained from young adult rodents. LTP induced by compressed theta burst stimulation (TBS), with a 10 s inter-episode interval, involves purely an increase in N (LTP<sub>N</sub>). In contrast, either a spaced TBS, with a 10 min inter-episode interval, or a single TBS, delivered when PKA is activated, results in LTP that is associated with a transient increase in γ (LTP<sub>γ</sub>), caused by the insertion of calcium-permeable (CP)-AMPA receptors. Activation of CaMKII is necessary and sufficient for LTP<sub>N</sub> whilst PKA is additionally required for LTP<sub>γ</sub>. Thus, two mechanistically distinct forms of LTP co-exist at these synapses.
Medical subject headings
- CA1 Region, Hippocampal
- Cyclic AMP-Dependent Protein Kinases
- Excitatory Postsynaptic Potentials
- Long-Term Potentiation
- Receptors, AMPA