Peritoneal macrophages as target cells for measuring virus-specific T cell mediated cytotoxicity in vitro

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Cell-mediated immunity plays a crucial role in viral infections.
• Thymus-derived lymphocytes (T cells) are key mediators of cellular immunity.
• Histocompatibility antigens, specifically the H-2 complex in mice, influence immune responses.

Purpose of the Study:

• To investigate the role of H-2 compatibility in the lysis of virally modified cells by T cells.
• To establish a model system for studying T cell-mediated cytotoxicity against viral infections using readily available target cells.

Main Methods:

• Inbred and outbred mice were used to study T cell-mediated lysis.
• Peritoneal macrophages were infected in vitro with Lymphocytic choriomeningitis virus (LCMV).
• Specific chromium-51 (51Cr) release assay was employed to quantify target cell lysis.

Main Results:

• Lysis of virally modified cells by T cells was strictly dependent on H-2 compatibility between effector and target cells.
• Peritoneal macrophages infected with LCMV served as effective syngeneic target cells.
• High levels of specific 51Cr release were observed when T cells from LCMV-immune mice were exposed to LCMV-infected macrophages.

Conclusions:

• H-2 compatibility is essential for T cell-mediated lysis of virally infected cells in mice.
• LCMV-infected peritoneal macrophages are a suitable and convenient model for studying T cell cytotoxicity in this system.
• This model system facilitates the investigation of cellular immune responses to viral pathogens.