Listeria monocytogenes specific T-cell lines and clones

Area of Science:

• Immunology
• Microbiology
• Cellular Biology

Background:

• Listeria monocytogenes is an intracellular bacterium that causes infection.
• Immunity to intracellular pathogens involves complex cellular interactions.
• T cells play a critical role in adaptive immunity.

Purpose of the Study:

• To investigate the roles of CD4 and CD8 T cells in protective immunity against Listeria monocytogenes.
• To elucidate the specific functions of T cell subsets in Listeria infection.

Main Methods:

• Analysis of T cell lines and clones from infected mice.
• In vitro antigen stimulation assays.
• Macrophage lysis assays.
• Interferon-gamma production assays.
• Adoptive transfer experiments.

Main Results:

• CD4 T cells produce lymphokines upon antigen stimulation.
• CD8 T cells lyse Listeria-primed macrophages.
• CD4 T cells can lyse Listeria-primed macrophages expressing Ia-molecules.
• CD8 T cells secrete Interferon-gamma with IL-2 supplementation.
• Both CD4 and CD8 T cell lines confer adoptive protection.

Conclusions:

• Both CD4 and CD8 T cells, with their respective helper and cytolytic functions, are essential for protective immunity to Listeria monocytogenes.
• These T cell subsets contribute to host defense through lymphokine production, direct lysis of infected cells, and cytokine secretion.