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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.
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Synaptic Signaling01:09

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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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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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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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The Synapse02:47

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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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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Related Experiment Video

Updated: Feb 10, 2026

Generation of Alpha-Synuclein Preformed Fibrils from Monomers and Use In Vivo
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Alpha-Synuclein: From Early Synaptic Dysfunction to Neurodegeneration.

Veronica Ghiglieri1,2, Valeria Calabrese2, Paolo Calabresi2,3

  • 1Dipartimento di Filosofia, Scienze Sociali, Umane e della Formazione, Università degli Studi di Perugia, Perugia, Italy.

Frontiers in Neurology
|May 22, 2018
PubMed
Summary

Alpha-synuclein (α-syn) protein is linked to Parkinson's disease (PD) pathology. This review covers α-syn's functions, neurodegenerative roles, and early molecular changes in PD pathogenesis.

Keywords:
experimental parkinsonismneurodegenerationprotein aggregationsynaptic plasticitysynucleinopathy

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pathology

Background:

  • Alpha-synuclein (α-syn) is a natively unfolded protein implicated in Parkinson's disease (PD).
  • Extensive research over two decades links α-syn to PD pathology.
  • Understanding α-syn's multifaceted roles is crucial for PD research.

Purpose of the Study:

  • To synthesize seminal and recent findings on alpha-synuclein.
  • To discuss the physiological and neurodegenerative aspects of α-syn.
  • To explore the relationship between α-syn and Parkinson's disease pathogenesis.

Main Methods:

  • Literature review of experimental and clinical studies.
  • Synopsis of research on α-syn's functions and pathology.
  • Focus on early cellular and molecular alterations.

Main Results:

  • Alpha-synuclein aggregation is a key feature in Parkinson's disease.
  • α-syn exhibits diverse roles, from physiological functions to neurotoxicity.
  • Early molecular and cellular changes are associated with α-syn aggregates.

Conclusions:

  • Alpha-synuclein is central to Parkinson's disease pathology.
  • Further investigation into α-syn's functions and aggregation is warranted.
  • Understanding α-syn's role may reveal new therapeutic targets for PD.