Macrophage cell lines derived from major histocompatibility complex II-negative mice

Area of Science:

• Immunology
• Cell Biology

Background:

• Macrophage cell lines are crucial tools for studying immune responses.
• Major histocompatibility complex (MHC) class II molecules play a key role in antigen presentation.
• Developing cell lines from MHC class II-deficient mice offers unique research opportunities.

Purpose of the Study:

• To establish and characterize novel bone-marrow-derived macrophage cell lines from MHC class II-negative mice.
• To evaluate the phenotypic and functional properties of these new cell lines.

Main Methods:

• Isolation and culture of bone-marrow-derived macrophages.
• Stabilization of C2D cell line with colony-stimulating factor-1.
• Transformation of C2Dt cell line with SV40 large T antigen.
• Assessment of cell morphology, surface molecule expression (Mac 1, Mac 2), growth characteristics, cytotoxicity, phagocytosis, cytokine secretion, and tumorigenicity.

Main Results:

• Two macrophage cell lines, C2D and C2Dt, were successfully established from MHC class II-negative mice.
• Both cell lines displayed macrophage-like morphology and expressed Mac 1 and Mac 2.
• They showed comparable growth to existing macrophage cell lines and phagocytosed Staphylococcus aureus.
• Cytotoxicity was modest and required stimulation with LPS and interferon-gamma.
• C2Dt cells were tumorigenic, while C2D cells were not.

Conclusions:

• Macrophage cell lines can be successfully derived from bone marrow of MHC class II-negative mice.
• These novel cell lines provide valuable models for investigating macrophage functions in the absence of MHC class II expression.
• The differential tumorigenicity of C2D and C2Dt cells warrants further investigation.