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Fibronectin-matrix sandwich-like microenvironments to manipulate cell fate.

J Ballester-Beltrán1, D Moratal, M Lebourg

  • 1Center for Biomaterials and Tissue Engineering, Universitat Politècnica de València, 46022 Valencia, Spain.

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Sandwich microenvironments mimic 3D cell surroundings, altering cell adhesion and proliferation. Dorsal stimuli significantly reduce cell proliferation and change cell behavior, highlighting the importance of 3D cell culture models.

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Area of Science:

  • Cell biology
  • Biomaterials science
  • Tissue engineering

Background:

  • Conventional 2D cell culture substrates do not accurately mimic the 3D extracellular matrix (ECM) environment.
  • Quasi-3D sandwich microenvironments offer a versatile platform to study cell behavior under more physiologically relevant conditions.

Purpose of the Study:

  • To investigate the role of dorsal stimuli in cell adhesion, proliferation, and ECM reorganization using sandwich microenvironments.
  • To compare cell behavior in quasi-3D sandwich cultures versus traditional 2D cultures.

Main Methods:

  • Utilized sandwich-like microenvironments to apply independent dorsal and ventral stimuli.
  • Assessed cell adhesion, focal plaque formation, actin cytoskeleton development, and integrin expression (α5/αv).
  • Measured cell signaling via pFAK/FAK levels and cell proliferation using the 5-bromo-2-deoxyuridine (BrdU) incorporation assay.
  • Investigated the influence of fibronectin (FN) adsorption on cell behavior within the sandwich system.

Main Results:

  • Dorsal stimuli in sandwich cultures inhibited focal plaque formation and actin cytoskeleton development.
  • Increased α5 versus αv integrin expression was observed in sandwich cultures compared to 2D controls.
  • Cell signaling (pFAK/FAK) was enhanced when cells were sandwiched after 3 hours of 2D ventral adhesion.
  • Cell proliferation was significantly reduced in sandwich conditions compared to 2D substrates.
  • Cellular reorganization of the dorsal matrix layer, influenced by fibronectin conformation and distribution, affected the observed results.

Conclusions:

  • Sandwich-like microenvironments effectively induce 3D-like cell behavior, including changes in adhesion, morphology, and proliferation.
  • This approach provides a robust method for mimicking in vivo cell microenvironments.
  • Dorsal stimuli play a critical role in modulating cell responses within these quasi-3D systems.