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Properties of a macrophage cell line transformed by simian virus 40. Morphological changes related to cell functions
Abstract:
A mouse macrophage clone (line nH-1) transformed by simian virus 40 (SV40) was examined by electron microscopy. In the growing phase of the cultures, NH-1 cells were non-phagocytic and SV40 T antigen-positive, and contained a large number of filament sheaths within their pseudopodia. In the late stationary phase, they became phagocytic, SV40 T antigen-negative and contained a filamentous network within their psudopodia. In addition, NH-1 cells in the late stationary phase were very similar to normal macrophages in other morphological properties.
Insights
Simian virus 40 (SV40) transformed mouse macrophages (nH-1 cells) exhibit distinct morphological changes. These cells shift from non-phagocytic to phagocytic, altering their internal structure and SV40 T antigen expression during culture phases.
Area of Science:
- Cell Biology
- Virology
- Immunology
Background:
- Mouse macrophage clones provide valuable models for studying cellular differentiation and function.
- Simian virus 40 (SV40) is a well-characterized DNA tumor virus known to induce transformation in various cell types.
- Understanding the morphological and functional changes in virus-transformed cells is crucial for cancer research and virology.
Purpose of the Study:
- To investigate the morphological characteristics of an SV40-transformed mouse macrophage clone (nH-1 cells) under different culture conditions.
- To correlate changes in SV40 T antigen expression with the functional state (phagocytosis) and ultrastructure of nH-1 cells.
- To compare the late-stage morphology of nH-1 cells with normal macrophages.
Main Methods:
- Electron microscopy was employed to examine the ultrastructure of nH-1 cells.
- Cell cultures were maintained and observed during both growing and late stationary phases.
- Immunofluorescence or Western blotting could be used to detect SV40 T antigen expression (though not explicitly stated, implied by results).
Main Results:
- In the growing phase, nH-1 cells were non-phagocytic, SV40 T antigen-positive, and displayed filament sheaths in pseudopodia.
- In the late stationary phase, nH-1 cells became phagocytic and SV40 T antigen-negative.
- Late-stage nH-1 cells showed a filamentous network within pseudopodia and exhibited morphological similarities to normal macrophages.
Conclusions:
- SV40 transformation induces dynamic morphological and functional changes in mouse macrophages.
- The expression of SV40 T antigen is inversely correlated with the phagocytic activity and specific ultrastructural features of nH-1 cells.
- SV40-transformed macrophages can revert to a morphology resembling normal macrophages under specific culture conditions, suggesting plasticity.