Infection by Listeria monocytogenes provides an excellent model for study of the complexities of the immune response to intracellular pathogens. Cell mediated immunity, particularly CD8+ T cells, are required for control of Listeria infection, probably due to its intracellular niche and its ability to escape from cellular phagosomes into the cytoplasm of host cells. Most proteins made by Listeria are retained inside the organism, separated from the MHC class I processing pathway by the bacterial membrane. As secreted proteins would be most readily accessible to class I peptide processing pathways it is suggested that the Listeria proteins most important for inducing protective CD8 T cells are secreted. Experiments are proposed to address this hypothesis by: 1) identifying new L. monocytogenes antigens that elicit CD8 T cells after in vivo infection; 2) assessing the in vivo protective capacity of CD8 T cells specific for L. monocytogenes antigens expressed in different bacterial compartments; and 3) testing the ability of CD8 T cells to mediate immunity against L. monocytogenes expressing the same CD8 T cell antigen in different bacterial compartments. The ability of T cells derived from infected mice and directed against antigens expressed in distinct bacterial compartments to protect mice from infection will be determined.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
First Independent Research Support & Transition (FIRST) Awards (R29)
Project #
5R29AI036864-05
Application #
2886952
Study Section
Bacteriology and Mycology Subcommittee 2 (BM)
Project Start
1995-07-15
Project End
2001-06-30
Budget Start
1999-07-01
Budget End
2001-06-30
Support Year
5
Fiscal Year
1999
Total Cost
Indirect Cost
Name
University of Iowa
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
041294109
City
Iowa City
State
IA
Country
United States
Zip Code
52242
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Harty, J T; Tvinnereim, A R; White, D W (2000) CD8+ T cell effector mechanisms in resistance to infection. Annu Rev Immunol 18:275-308
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Badovinac, V P; Corbin, G A; Harty, J T (2000) Cutting edge: OFF cycling of TNF production by antigen-specific CD8+ T cells is antigen independent. J Immunol 165:5387-91
Badovinac, V P; Harty, J T (2000) Adaptive immunity and enhanced CD8+ T cell response to Listeria monocytogenes in the absence of perforin and IFN-gamma. J Immunol 164:6444-52

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