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Related Concept Videos

Synaptic Signaling01:09

Synaptic Signaling

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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.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
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Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
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Integration of Synaptic Events01:28

Integration of Synaptic Events

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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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Role of Neurotransmitters in Memory01:23

Role of Neurotransmitters in Memory

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Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
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Chemical Synapses01:26

Chemical Synapses

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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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Long-term Potentiation01:25

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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Related Experiment Video

Updated: Oct 10, 2025

Investigation of Synaptic Tagging/Capture and Cross-capture using Acute Hippocampal Slices from Rodents
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Synaptic memory requires CaMKII.

Wucheng Tao1,2, Joel Lee2, Xiumin Chen2

  • 1Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Medical University, Fuzhou, China.

Elife
|December 15, 2021
PubMed
Summary

Calcium-calmodulin-dependent kinase II (CaMKII) is essential for maintaining long-term potentiation (LTP), a key cellular model for memory. Inhibiting CaMKII erases LTP, but transient inhibition enhances it, suggesting CaMKII acts as a molecular memory storage device.

Keywords:
LTPcamk2hippocampusion channelmouseneurosciencereceptorsynapse

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Molecular Biology

Background:

  • Long-term potentiation (LTP) is a crucial cellular model for understanding learning and memory.
  • While LTP induction mechanisms are known, LTP maintenance has been debated for two decades.

Purpose of the Study:

  • To investigate the role of Ca2+-calmodulin-dependent kinase II (CaMKII) in the maintenance of LTP.
  • To determine if CaMKII functions as a molecular storage device for memory.

Main Methods:

  • Investigated the effects of acute and transient CaMKII inhibition on established LTP.
  • Measured CaMKII's contribution to synaptic transmission.

Main Results:

  • CaMKII was found to be necessary for LTP maintenance.
  • Acute CaMKII inhibition led to the erasure of LTP.
  • Transient CaMKII inhibition enhanced subsequent LTP.
  • CaMKII contributes to synaptic transmission.

Conclusions:

  • CaMKII plays a critical role in maintaining synaptic plasticity associated with memory.
  • CaMKII functions as a molecular storage mechanism for memory consolidation.
  • These findings resolve the long-standing debate regarding LTP maintenance.