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The generation of macrophage-like cell lines by transfection with SV40 origin defective DNA
Abstract:
Two cell lines with properties of mature macrophages have been generated by transfection with SV40 DNA mutated in the origin of replication. One line, BAM, was derived from bone marrow cells from a BALB/c mouse. The other line, BAC1, was derived from splenic adherent cells from a (BALB/c X A.CA) F1 mouse. Both lines produce lysozyme, collagenase, and esterase, bear Fc receptors, and engage in Fc-mediated phagocytosis. Both lines require colony-stimulating factor-1 for continued proliferation. In addition, they express Ia antigens, and may be induced to secrete IL 1. This technique should make possible the generation of Ia-bearing diploid macrophage lines from any strain of mouse. In addition, it may be possible to use this technique to derive monocyte lines from species in which wild-type SV40 DNA causes a lytic infection.
Insights
Researchers generated mature macrophage cell lines from mouse cells using mutated SV40 DNA. These cell lines exhibit key macrophage functions and require colony-stimulating factor-1 for growth, offering a new tool for immunology research.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Macrophages are crucial immune cells involved in host defense and tissue homeostasis.
- Establishing stable, well-characterized macrophage cell lines is essential for studying their functions and responses.
Purpose of the Study:
- To generate immortalized macrophage cell lines with mature properties.
- To characterize these cell lines for their functional and phenotypic attributes.
- To establish a versatile method for creating macrophage lines from various mouse strains.
Main Methods:
- Transfection of mouse bone marrow and splenic adherent cells with origin-mutated SV40 DNA.
- Characterization of cell lines for enzymatic activity (lysozyme, collagenase, esterase).
- Assessment of Fc receptor expression, Fc-mediated phagocytosis, and Ia antigen expression.
- Evaluation of dependency on colony-stimulating factor-1 for proliferation.
- Induction of Interleukin-1 (IL-1) secretion.
Main Results:
- Two distinct macrophage cell lines, BAM and BAC1, were successfully generated.
- Both cell lines demonstrated mature macrophage characteristics, including enzyme production and Fc receptor-mediated phagocytosis.
- Proliferation of both lines was dependent on colony-stimulating factor-1.
- Ia antigens were expressed, and IL-1 secretion could be induced.
- The technique proved effective for generating Ia-bearing diploid macrophage lines from different mouse strains.
Conclusions:
- The described method enables the generation of stable, functional macrophage cell lines from diverse mouse genetic backgrounds.
- This technique holds potential for deriving monocyte lines from species where wild-type SV40 infection is lytic.
- These immortalized macrophage lines serve as valuable tools for immunological research.