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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.
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The microtubule cytoskeleton at the synapse.

Julie Parato1, Francesca Bartolini2

  • 1Columbia University Medical Center, Department of Pathology & Cell Biology, 630 West 168(th)Street, P&S 15-421, NY, NY, 10032, United States; SUNY Empire State College, Department of Natural Sciences, 177 Livingston Street, Brooklyn, NY, 11201, United States.

Neuroscience Letters
|March 29, 2021
PubMed
Summary

Microtubules (MTs) are crucial for neuronal structure and transport. Recent research highlights their essential roles in synaptic function, with implications for neurological diseases.

Keywords:
AMPAActive zoneDendritic spinesEn passant boutonsGABA(A)Kif1AMicrotubulesNMDAPostsynaptic densitySynapsesSynaptic vesicleSynaptotagmin IV

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Microtubules (MTs) are essential for neuronal structure, providing support for axons and dendrites.
  • Both stable and dynamic MTs are critical for normal neuronal function and intracellular transport.

Purpose of the Study:

  • To review the diverse functions of microtubules in synaptic structure and function.
  • To explore MT roles in excitatory, inhibitory, and specialized synapses, including the neuromuscular junction.
  • To discuss the potential implications of MT function in neurological disorders.

Main Methods:

  • Literature review of recent research on microtubule functions in neurons.
  • Synthesis of findings on MT involvement in synaptic plasticity and signaling.
  • Analysis of the link between MT dysfunction and neurological disease pathogenesis.

Main Results:

  • Microtubules play significant roles in both presynaptic and postsynaptic elements of synapses.
  • MTs are involved in the structural organization and dynamic regulation of synaptic components.
  • Evidence suggests MTs are critical for synaptic transmission and plasticity.

Conclusions:

  • Microtubules are integral to synaptic architecture and function, extending beyond their established roles in transport and structural support.
  • Understanding MTs' synaptic roles offers new insights into the mechanisms underlying neurological diseases.
  • Targeting microtubule dynamics may present novel therapeutic strategies for neurological conditions.