Related Experiment Videos
Vimentin filaments in peritoneal macrophages at various stages of differentiation and with altered function
Abstract:
Comparative immunofluorescence microscopic, transmission and scanning electron microscopic investigations were carried out to study the arrangement and significance of vimentin filaments in monocytes, macrophages, epithelioid cell equivalents and multinucleate giant cells under various different functional conditions, and in the presence of functional disorders. Uncoated or sebum-coated coverslips were implanted in the peritoneal cavity of Wistar rats. Some of the animals received repeated i.p. injections of colchicine. Rats were killed at various times 1 to 14 days after initiation of the experiment. The number of macrophages, the degree of their activation, and the growth of cells on the coverslips was considerably greater on sebum-coated than on uncoated implants. Various characteristic vimentin distribution patterns were found dependent on the cell cycle, the form and volume of the cell, and on the degree of differentiation and maturity; they were also related to the type and intensity of cell function. These patterns were best developed in ordered multinucleate giant cells. Repeated administrations of colchicine resulted in a marked flattening of the cell body on the coverslips--which correlated with a considerable reduction in the number of vimentin filaments and of cytoplasmic processes--and also in the formation of circumscribed erect, tree-like protuberances. The "trunk" of these structures comprised closely bundled vimentin filaments, and the cell nucleus was located at its base. These morphologic changes, which were associated with a functional insufficiency, proved to be reversible.
Insights
Vimentin filaments in immune cells change based on cell function and maturity. Colchicine treatment disrupts vimentin organization, impacting cell shape and function reversibly.
Area of Science:
- Cell Biology
- Immunology
- Microscopy
Background:
- Vimentin filaments are crucial cytoskeletal components in various cell types.
- Understanding vimentin's role in immune cells under different conditions is important for cell biology.
- Functional disorders can impact cellular morphology and cytoskeletal organization.
Purpose of the Study:
- To investigate the arrangement and significance of vimentin filaments in monocytes, macrophages, epithelioid cells, and multinucleate giant cells.
- To examine how vimentin organization changes under various functional conditions and in the presence of functional disorders.
- To assess the impact of colchicine on vimentin distribution and cell morphology.
Main Methods:
- Comparative immunofluorescence microscopy, transmission electron microscopy, and scanning electron microscopy were employed.
- Wistar rats were used with peritoneal implants (uncoated and sebum-coated coverslips).
- Colchicine was administered to assess its effects on vimentin and cell morphology.
Main Results:
- Sebum-coated implants promoted greater macrophage numbers, activation, and cell growth compared to uncoated implants.
- Characteristic vimentin distribution patterns were observed, correlating with cell cycle, size, differentiation, maturity, and function.
- Colchicine treatment led to cell flattening, reduced vimentin filaments, and formation of erect, tree-like protuberances with bundled vimentin.
Conclusions:
- Vimentin filament arrangement is dynamic and reflects the functional state and differentiation of immune cells.
- Colchicine-induced alterations in vimentin organization are linked to functional insufficiency but are reversible.
- Multinucleate giant cells exhibit well-developed vimentin patterns, highlighting their complex structure and function.