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Related Experiment Videos

Modulation of cell-extracellular matrix interactions

J L Sechler1, S A Corbett, M B Wenk

  • 1Department of Molecular Biology, Princeton University, New Jersey 08544-1014, USA.

Annals of the New York Academy of Sciences
|January 26, 1999
PubMed
Summary
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Cellular responses to extracellular matrix (ECM) depend on its composition and structure. Fibronectin (FN) and fibrin matrices alter cell shape and actin organization, impacting cell phenotype and signaling.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Biomaterials Science

Background:

  • Extracellular matrix (ECM) composition and structure critically regulate cell behavior, influencing processes like morphogenesis.
  • Fibronectin (FN) is a key ECM component involved in cell adhesion, migration, and matrix assembly.

Purpose of the Study:

  • To investigate how different extracellular matrix (ECM) compositions and structures, specifically those involving fibronectin (FN), affect cell behavior and intracellular organization.
  • To identify specific domains within FN required for matrix assembly and understand their impact on cell signaling.

Main Methods:

  • Development of two FN-based model systems: one mimicking a provisional wound matrix (FN cross-linked into fibrin) and another using recombinant FNs for matrix assembly studies.
  • Comparative analysis of cell morphology, actin filament distribution, and focal adhesion formation on different ECM substrates.

Related Experiment Videos

  • Investigation of FN fibril formation using recombinant FNs to identify critical domains for matrix assembly.

    • Main Results:

    • Cells cultured on an FN-fibrin matrix exhibited distinct morphologies compared to cells on FN alone, with smaller size and cortical actin distribution.
    • The addition of tenascin to the FN-fibrin matrix induced further changes in cell phenotype, highlighting the impact of matrix composition.
    • A specific domain in recombinant FN was identified as essential for normal FN fibril formation.
    • During the assembly of recombinant FN matrices, delays in actin stress fiber and focal adhesion formation were observed.

    Conclusions:

    • Matrix composition profoundly influences cell phenotype and behavior.
    • Changes in ECM structure, such as during FN fibril assembly, can alter intracellular organization, including actin stress fibers and focal adhesions.
    • The identified FN domain is crucial for proper matrix assembly, impacting cell-matrix interactions and downstream signaling pathways.