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Generation and characterization of a microglial cell line, MG5, derived from a p53-deficient mouse
1Department of Neurochemistry, National Institute of Neuroscience, Kodaira, Tokyo, Japan.
Abstract:
We have established a cell line cloned from primary-cultured microglia obtained from p53-deficient mice. The cell line, MG5, could be grown in astrocyte-conditioned medium and has been maintained for more than a year. MG5 cells are immunocytochemically positive for Mac-1 and F4/80 antibody and express the major histocompatibility complex (MHC) class I antigen, leukocyte function-associated antigen-1, leukocyte common antigen, and intercellular adhesion molecular-1 mRNA. Interferon-gamma enhanced the expression of MHC class II antigen mRNA in MG5 cells. We previously identified a novel calcium-binding protein, Iba1 (ionized calcium-binding adapter molecule 1), which is highly and specifically expressed in cultured microglia. Iba1 protein was also immunocytochemically demonstrated in MG5 cells. The cells retained non-specific esterase activity, 5'-nucleotidase activity, acid phosphatase activity, and phagocytic ability. Like primary cultured microglia from wild-type mice, MG5 cells released nitric oxide in response to lipopolysaccharide, and actively proliferated in the presence of mitogenic factors such as macrophage-colony stimulating factor (M-CSF), granulocyte/macrophage-CSF (GM-CSF), and interleukin-3 (IL-3). Tyrosine-phosphorylation of M-CSF receptor in MG5 cells was induced by the addition of M-CSF or astrocyte-conditioned medium. These findings indicate that MG5 cells preserve the morphological, biochemical, and physiological properties of primary-cultured microglia well. The MG5 cell line will be a useful tool for studying microglial function.
Insights
A new cell line, MG5, derived from mouse microglia, retains key biological functions. This valuable research tool aids in studying microglial biology and function.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are crucial immune cells in the central nervous system.
- Establishing stable microglial cell lines is essential for research.
- Primary microglia cultures present challenges for long-term studies.
Purpose of the Study:
- To establish and characterize a novel cell line (MG5) from primary-cultured microglia.
- To assess the preservation of microglial characteristics in the MG5 cell line.
- To evaluate the utility of MG5 cells for microglial research.
Main Methods:
- Established MG5 cell line from p53-deficient mouse primary microglia.
- Cultured MG5 cells in astrocyte-conditioned medium.
- Performed immunocytochemistry, mRNA expression analysis, and functional assays (e.g., phagocytosis, nitric oxide release).
Main Results:
- MG5 cells expressed microglial markers (Mac-1, F4/80, Iba1) and MHC antigens.
- MG5 cells exhibited enzymatic activities and phagocytic capabilities.
- MG5 cells responded to stimuli like lipopolysaccharide and mitogens (M-CSF, GM-CSF, IL-3), releasing nitric oxide and proliferating.
- Tyrosine phosphorylation of M-CSF receptor was observed in MG5 cells.
Conclusions:
- The MG5 cell line successfully preserves key morphological, biochemical, and physiological properties of primary microglia.
- MG5 cells demonstrate functional similarities to primary microglia, including immune responses and proliferation.
- The MG5 cell line represents a valuable and stable tool for investigating microglial biology and function.