Intermediate filament aggregation: effect on cell topology, cell spreading and surface transport

Area of Science:

• Cell Biology
• Cytoskeleton Dynamics
• Biophysics

Background:

• Intermediate filaments and microtubules are key cytoskeletal components.
• Their roles in cell spreading and phagocytosis are complex and interconnected.

Purpose of the Study:

• To investigate the necessity of microtubules and normal intermediate filament distribution for cell spreading and particle uptake.
• To examine how experimentally aggregated intermediate filaments influence cell surface topology and phagocytosis.

Main Methods:

• Chick fibroblasts were treated with cytochalasin-B and colcemid.
• Cells were cultured on various surfaces, including those coated with gold particles.
• Cell morphology, intermediate filament organization, and particle-cell interactions were observed.

Main Results:

• Treated cells became flat with apical corrugations, housing intermediate filament bundles.
• Cells spread and phagocytosed gold particles effectively, even without microtubules or normal intermediate filament distribution.
• Aggregated intermediate filaments altered cell topology and particle ingestion pathways.

Conclusions:

• Microtubules are not essential for cell spreading, particle transport, or phagocytosis.
• Normal intermediate filament distribution is also not required for these cellular functions.
• Experimental manipulation of intermediate filaments can significantly modify cell surface characteristics and particle handling.