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CD81 Promotes a Migratory Phenotype in Neuronal-Like Cells.

Soraia A Martins1, Patrícia D Correia1, Roberto A Dias1

  • 1Department of Medical Sciences,Cell Differentiation and Regeneration Laboratory,Institute of Biomedicine (iBiMED),Universidade de Aveiro,Campus de Santiago, 3810-193 Aveiro,Portugal.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|February 5, 2019
PubMed
Summary

Tetraspanin CD81 enhances neuronal cell migration by interacting with AKT and actin. This promotes cell motility and morphology changes, suggesting a role in processes like tumor metastasis.

Keywords:
CD81 tetraspaninPI3K–AKT signalingSH-SY5Y neuroblastoma cellsactin remodelingneuronal migration

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Tetraspanins, including CD81, are transmembrane proteins involved in cell functions.
  • CD81 interactions with other proteins influence cell adhesion, morphology, migration, and differentiation.
  • The specific role of CD81 in neuronal cell migration remains largely uncharacterized.

Purpose of the Study:

  • To investigate the effect of CD81 on the migratory phenotype of SH-SY5Y neuroblastoma cells.
  • To elucidate the molecular mechanisms underlying CD81-mediated neuronal cell migration.

Main Methods:

  • Immunofluorescence microscopy to assess CD81 localization and co-localization with F-actin and AKT.
  • Overexpression of CD81 in SH-SY5Y cells.
  • Pharmacological inhibition of phosphatidylinositol 3 kinase (PI3K) pathway.

Main Results:

  • CD81 is localized at the cell membrane, co-localizing with F-actin in structures crucial for migration.
  • CD81 overexpression significantly increased the migratory phenotype of SH-SY5Y cells.
  • CD81 co-localizes with AKT at the plasma membrane, and PI3K inhibition disrupts CD81 and F-actin localization, reducing cell migration.

Conclusions:

  • CD81 acts as a bridge between active AKT and actin, facilitating actin remodeling essential for neuronal cell motility.
  • The CD81-AKT-actin axis plays a critical role in regulating the migratory phenotype of neuronal-like cells.
  • Understanding this mechanism can provide insights into cell migration, differentiation, and tumor metastasis.