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Cytoskeleton of mouse embryo fibroblasts. Electron microscopy of platinum replicas
Abstract:
We have studied the distribution of cytoskeletal elements in detergent-extracted mouse embryo fibroblasts using the platinum replica technique. It was shown that lamelloplasm can be subdivided into three zones: 1) the ruffle edge with dense microfilament meshwork; 2) the sparse zone adjacent to the ruffle edge and containing relatively few cytoskeletal elements; 3) the lamella proper occupied with a three-dimensional network of microfilaments, microtubules, intermediate filaments; this zone contained adhesion plaques corresponding to cell-substrate focal contacts and associated with the microfilament bundle ends. The cytoskeleton structure of the central (endoplasm) region of the cell was markedly different from that of the lamelloplasm. Its main feature was a dense microfilament sheath at the dorsal cell surface. Sites of microfilament bundle convergence can be visualized near the nucleus after partial removal of the sheath by more complete detergent extraction.
Insights
This study maps the cytoskeleton in mouse embryo fibroblasts, revealing distinct zones in the lamelloplasm and a unique microfilament sheath in the cell's central region. These findings detail cytoskeletal organization critical for cell structure and function.
Area of Science:
- Cell Biology
- Cytoskeleton Dynamics
Background:
- Understanding the spatial organization of the cytoskeleton is crucial for cell motility and structure.
- Fibroblasts exhibit complex cytoskeletal arrangements essential for their functions.
Purpose of the Study:
- To investigate the distribution and organization of cytoskeletal elements in mouse embryo fibroblasts.
- To delineate distinct zones within the cell's lamelloplasm based on cytoskeletal composition.
Main Methods:
- Utilized the platinum replica technique for high-resolution visualization of detergent-extracted cells.
- Analyzed cytoskeletal distribution in mouse embryo fibroblasts.
Main Results:
- Identified three distinct zones within the lamelloplasm: ruffle edge, sparse zone, and lamella proper.
- Described a dense microfilament sheath at the dorsal surface of the central cell region (endoplasm).
- Observed adhesion plaques and focal contacts associated with microfilament bundles in the lamella proper.
Conclusions:
- The lamelloplasm exhibits a structured organization of microfilaments, microtubules, and intermediate filaments.
- The central cell region possesses a unique cytoskeletal architecture compared to the lamelloplasm.
- Cytoskeletal organization is spatially regulated, with specific structures like adhesion plaques playing key roles in cell-substrate interactions.