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Related Concept Videos

Integration of Synaptic Events01:28

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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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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.
Hebbian LTP
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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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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Temporal variations in presynaptic release probability in the lateral habenula.

Hoyong Park1, Myunghyun Cheon1, Sungmin Kim1

  • 1Department of Biological Sciences, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, South Korea.

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The lateral habenula (LHb) exhibits daily rhythms in its neuronal communication. Presynaptic efficacy in LHb neurons increases in the afternoon, suggesting a biological clock influences neurotransmission.

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Area of Science:

  • Neuroscience
  • Chronobiology

Background:

  • Biological systems exhibit rhythmicity, crucial for function.
  • The habenular complex has an intrinsic molecular clock with rhythmic gene expression (e.g., PER2).

Purpose of the Study:

  • To investigate temporal rhythmicity in the presynaptic efficacy of lateral habenula (LHb) neurons.
  • To determine if LHb neurotransmission shows time-of-day variations.

Main Methods:

  • Electrophysiological recordings of LHb neurons at different times during the light phase.
  • Analysis of spontaneous excitatory transmission, paired-pulse ratio, and minimal stimulation success rate.
  • Control recordings from hippocampal pyramidal neurons.

Main Results:

  • Increased frequency and amplitude of spontaneous excitatory transmission in the LHb afternoon vs. morning.
  • Significant time-dependent differences in paired-pulse ratio and minimal stimulation success rate in LHb.
  • No significant temporal differences observed in hippocampal pyramidal neurons.

Conclusions:

  • The LHb displays intrinsic temporal oscillations in basal neurotransmission.
  • Presynaptic release probability in the LHb is subject to daily rhythmicity.
  • Further research into LHb synaptic transmission is warranted due to its functional importance.