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A tale of timing and transport
1Molecular Cellular and Integrative Physiology IDP Graduate Program, The David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA.
Neuron
|September 2, 2003
Summary
Spike-timing-dependent plasticity is now observed at inhibitory synapses. Coincident neuronal activity modifies the chloride reversal potential via KCC2, altering inhibitory synapse effectiveness.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Cellular Electrophysiology
Background:
- Long-term plasticity is a hallmark of excitatory and inhibitory synapses.
- Spike-timing-dependent plasticity (STDP) was previously exclusive to excitatory connections.
- The mechanisms underlying plasticity at inhibitory synapses remained elusive.
Discussion:
- Woodin et al. demonstrate that STDP can occur at inhibitory synapses.
- This plasticity is mediated by the neuronal K+/Cl- cotransporter KCC2.
- Activity-dependent shifts in the chloride reversal potential are key.
Key Insights:
- Coincident pre- and postsynaptic activity induces inhibitory synaptic plasticity.
- KCC2 transporter activity is modulated by neuronal firing patterns.
- The effectiveness of GABAergic synapses is dynamically regulated.
Outlook:
- This finding expands our understanding of synaptic plasticity mechanisms.
- Potential implications for neurological disorders involving GABAergic signaling.
- Further research into KCC2 regulation and its role in brain function.