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Filopodia of spreading 3T3 cells. Do they have a substrate-exploring function?
The Journal of Cell Biology
|May 1, 1976
Summary
Mouse 3T3 cells use filopodia to sense different surfaces. Lamellipodia then extend towards preferred substrates, guiding cell movement and adhesion.
Area of Science:
- Cell Biology
- Biophysics
- Materials Science
Background:
- Cells extend filopodia to explore their environment.
- Substrate properties influence cell behavior and migration.
Purpose of the Study:
- To investigate how 3T3 cells extend lamellipodia in response to different substrates contacted by filopodia.
- To understand the role of filopodia in substrate exploration and directed cell movement.
Main Methods:
- Observing 3T3 cell behavior on a mixed substrate of glass and gold.
- Analyzing lamellipodia extension direction after filopodia contact with different surfaces.
- Using Cytochalasin B to assess the involvement of actin dynamics.
Main Results:
- Filopodia contacting both glass and gold induced preferential lamellipodia extension towards gold.
- Filopodia contacting other cells and glass induced preferential lamellipodia extension towards glass.
- Cytochalasin B reversibly inhibited directed lamellipodia extension at high concentrations.
Conclusions:
- Filopodia act as sensory organs, detecting substrate qualities.
- Substrate-directed lamellipodia extension guides cell migration.
- Actin dynamics are crucial for this substrate-responsive cell movement.