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Cell shape provides global control of focal adhesion assembly
Christopher S Chen1, Jose L Alonso, Emanuele Ostuni
1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 2120, USA.
Biochemical and Biophysical Research Communications
|July 16, 2003
Summary
Cell shape and size influence focal adhesion (FA) formation. Increased cell spreading and tension drive FA assembly, revealing an inside-out mechanism crucial for cell function in tissues.
Area of Science:
- Cell biology
- Biophysics
- Biochemistry
Background:
- Cell adhesion is mediated by focal adhesions (FAs).
- Cell spreading and cytoskeletal tension are key regulators of FA dynamics.
- Integrin-ligand interactions are critical for cell attachment and signaling.
Purpose of the Study:
- To investigate how cell morphology and mechanics regulate focal adhesion assembly.
- To elucidate the role of cytoskeletal tension in focal adhesion formation.
- To understand the 'inside-out' signaling mechanism controlling cell adhesion.
Main Methods:
- Culturing cells on adhesive islands of varying sizes and shapes.
- Utilizing fibronectin-coated surfaces and non-adhesive regions.
- Stimulating cytoskeletal tension with thrombin and using contractility inhibitors.
- Quantifying focal adhesions containing vinculin and phosphotyrosine.
Main Results:
- Cell spreading, controlled by island geometry, directly correlated with FA amount.
- Focal adhesions localized asymmetrically under high tensional stress.
- Increased cytoskeletal tension enhanced FA staining, while reduced contractility disassembled FAs.
- Demonstrated an 'inside-out' mechanism where cell distortion increases tension, driving FA assembly.
Conclusions:
- Cell morphology and mechanics are critical for regulating focal adhesion assembly.
- Cytoskeletal tension acts as a feedback mechanism to promote focal adhesion formation.
- This interplay is vital for cell integration and function within tissues.
Keywords:
Non-programmatic