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Related Concept Videos

Neurulation01:30

Neurulation

Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...

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Neuritin 1 promotes neuronal migration.

Arianna Zito1, Daniele Cartelli, Graziella Cappelletti

  • 1Dipartimento di Scienze Farmacologiche e Biomolecolari and Centre of Excellence on Neurodegenerative Diseases, Università degli Studi di Milano, Italia, Via Balzaretti, 9, 20133, Milan, Italy.

Brain Structure & Function
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Summary

Neuritin 1 (Nrn1) promotes neuronal migration and affects cell morphology by influencing microtubule stability. This discovery offers new insights into brain development and synaptic plasticity.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Neuritin 1 (Nrn1) is an activity-dependent protein crucial for synaptic plasticity and brain development.
  • Neuronal migration is a fundamental process during brain development that underlies synaptic plasticity.

Purpose of the Study:

  • To investigate the potential role of Neuritin 1 (Nrn1) in controlling neuronal migration.
  • To elucidate the molecular mechanisms by which Nrn1 influences neuronal cell behavior.

Main Methods:

  • Analysis of Nrn1 expression in migrating (GN11) and non-migrating (GT1-7) neuronal cell models.
  • In vitro assays including Boyden's microchemotaxis, scratch-wounding, and live cell imaging.
  • Ex vivo validation using rat cortical interneurons, Boyden chamber assays, and focal electroporation of brain slices.

Main Results:

  • Nrn1 expression is significantly higher in migrating GN11 cells compared to non-migrating GT1-7 cells.
  • Overexpression of Nrn1 enhanced GN11 cell migration, while Nrn1 silencing decreased it.
  • Nrn1 modulation affected cell morphology and induced α-tubulin post-translational modifications, indicating an impact on microtubule stability.

Conclusions:

  • Neuritin 1 (Nrn1) plays a novel and significant role in promoting neuronal cell migration.
  • Nrn1 levels directly influence microtubule stability, impacting neuronal morphology and migration.
  • These findings provide new understanding of Nrn1's function in brain development and neuronal plasticity.