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Related Concept Videos

Long-term Potentiation01:35

Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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A spike-timing-dependent plasticity rule for dendritic spines.

Sabrina Tazerart1,2, Diana E Mitchell1,2, Soledad Miranda-Rottmann1,2

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Spike-timing-dependent plasticity (STDP) involves changes in synaptic strength. This study reveals that clustered excitatory inputs enhance long-term potentiation (LTP) and disrupt long-term depression (LTD), leading to LTP-only STDP.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • The precise structural basis of spike-timing-dependent plasticity (STDP) is not fully understood.
  • Excitatory inputs play a crucial role in synaptic plasticity, but their spatial organization's impact on STDP is unclear.

Purpose of the Study:

  • To investigate the structural organization of excitatory inputs that support STDP.
  • To determine how the spatial arrangement of activated spines influences timing-dependent long-term potentiation (t-LTP) and timing-dependent long-term depression (t-LTD).

Main Methods:

  • Utilized a two-photon (2P) glutamate uncaging technique to activate presynaptic inputs.
  • Paired uncaging with postsynaptic spiking in layer 5 pyramidal neurons of juvenile mice to induce STDP.
  • Analyzed changes in spine neck structure and synaptic strength following plasticity induction protocols.

Main Results:

  • Pre-post pairings inducing t-LTP caused spine neck shrinkage and increased synaptic strength.
  • Post-pre pairings inducing t-LTD decreased synaptic strength without altering spine shape.
  • Clustered spine activation (<5 μm) enhanced t-LTP via NMDA receptor activation, calcium influx, and actin polymerization-dependent neck shrinkage.
  • t-LTD was NMDA receptor-dependent and disrupted by clustered spine activation, but recovered when spines were separated by >40 μm.

Conclusions:

  • Synaptic cooperativity among clustered inputs disrupts t-LTD.
  • Synaptic cooperativity extends the temporal window for t-LTP induction.
  • These findings suggest that STDP in this context exclusively encompasses LTP due to the influence of input clustering.