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Long-term Potentiation01:35

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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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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Hebbian LTP
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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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Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices
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Synaptic amplification by dendritic spines enhances input cooperativity.

Mark T Harnett1, Judit K Makara, Nelson Spruston

  • 1HHMI Janelia Farm Research Campus, Ashburn, Virginia 20147, USA.

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Summary
This summary is machine-generated.

Dendritic spines act as crucial electrical compartments, significantly amplifying synaptic inputs. This amplification enhances neuronal computation and plasticity by promoting interactions between coactive inputs.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Cellular Electrophysiology

Background:

  • Dendritic spines are primary sites of excitatory synaptic input in neurons.
  • Spines are theoretically proposed to act as modifiable chemical and electrical compartments regulating synaptic function.
  • Experimental evidence supports activity-dependent structural and biochemical compartmentalization by spines, but their electrical role remains debated.

Purpose of the Study:

  • To investigate the electrical influence of dendritic spines on synaptic transmission and neuronal signaling.
  • To quantify the spine neck resistance and its impact on synaptic depolarization.
  • To determine how spine electrical properties affect neuronal integration and computation.

Main Methods:

  • Measurement of voltage amplitude ratios between spine heads and parent dendrites in rat hippocampal CA1 pyramidal neurons.
  • Calculation of spine neck resistance (R(neck)) based on measured voltage ratios and dendritic impedance.
  • Development and utilization of a morphologically realistic compartmental model to simulate spine electrical behavior.

Main Results:

  • Spine neck resistance (R(neck)) was found to be substantial (~500 MΩ).
  • This high R(neck) leads to significant amplification (1.5- to 45-fold) of spine head depolarization from unitary synaptic inputs.
  • Spines create a high-impedance input structure across the dendritic arbor and promote electrical interaction among coactive inputs via R(neck)-dependent conductance activation.

Conclusions:

  • The electrical properties of dendritic spines, particularly their high neck resistance, are critical for amplifying synaptic inputs.
  • Spine-mediated amplification enhances nonlinear dendritic integration and facilitates activity-dependent plasticity.
  • These electrical functions fundamentally augment the computational power of neurons.