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Organization of intermediate filaments and their association with collagen-containing phagosomes in mouse decidual
T M Zorn1, S F de Oliveira, P A Abrahamsohn
1Department of Histology and Embryology, University of São Paulo, Brazil.
Insights
Intermediate filaments (IF) form extensive networks within mouse decidual cells, concentrating near the nucleus and surrounding phagosomes. This study details the cytoplasmic distribution and associations of IF in these specialized cells.
Area of Science:
- Cell Biology
- Cytoskeletal Dynamics
- Decidual Cell Biology
Background:
- Decidual cells are crucial for pregnancy, but their internal structure, particularly intermediate filament (IF) organization, remains incompletely understood.
- Intermediate filaments provide structural support and participate in various cellular processes.
Purpose of the Study:
- To investigate the distribution and ultrastructural associations of intermediate filaments (IF) within the cytoplasm of mature mouse decidual cells.
Main Methods:
- Immunofluorescence microscopy was used to visualize intermediate filaments.
- Electron microscopy was employed to examine the fine structure and associations of IF.
Main Results:
- Intermediate filaments were observed throughout the cytoplasm of decidual cells, with preferential accumulation around the nucleus.
- A rich network of IF extended from the perinuclear region to the cell periphery.
- IF were closely associated with nuclear pore complexes, gap junctions, mitochondria, lysosomes, and particularly with phagosomes containing collagen fibrils.
Conclusions:
- Intermediate filaments form a complex and dynamic network within mouse decidual cells.
- The observed associations suggest a role for IF in organelle positioning, cell-cell communication, and phagosome processing, including collagen degradation.
Abstract:
We have analyzed the distribution of intermediate filaments (IF) in the cytoplasm of mature decidual cells of mice. IF were scattered throughout the cytoplasm of these cells although there was a preferential accumulation around the nuclei. In many cells a large area of the cytoplasm was occupied by a rich network of IF that extended from the perinuclear region toward the cell surface. Thin bundles of IF crossed the cytoplasm without a preferential orientation. IF were also seen in close association with nuclear pore complexes, gap junctions, mitochondria, and lysosomes. A very developed network of IF surrounded phagosomes that contained collagen fibrils. Longitudinal and cross sections of these phagosomes showed a very close association of IF with the phagosome membrane.