The formation of trimolecular complex of processed antigen, MHC class II proteins, and T-cell receptor (TCR) is essential for immune responses to both pathogens and self proteins. Antigens contain multiple determinants, yet only a handful of dominant epitopes are strongly recognized by T-cell in the context of class II, a process called immunodominance. The molecular events that control immunodominance are complex, with both APC and T-cells potentially serving regulatory roles. This study will investigate the role of APC and the processing reactions within these cells in regulating immunodominance. The long term goals of this research are to delineate the role of APC in regulating immune responses and to elucidate the intracellular events which control antigen presentation. Studies to define the molecular and cellular steps which guide epitope selection are included in 3 Specific Aims: 1) Processing reactions within APC modulate the presentation of dominant and subdominant epitopes; 2) dominant and subdominant epitopes are formed and intersect class II antigens in different subcellular compartments; 3) selection of immunodominant epitopes from endogenous antigens is differentially controlled by HLA-DM-dependent and independent pathways. Biochemical, cell biological, and functional approaches will be used to test these hypotheses. Understanding epitope selection and immunodominance may be key to enhancing host pathogen resistance as well as modulating autoimmunity.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI033418-09
Application #
6169921
Study Section
Immunobiology Study Section (IMB)
Program Officer
Deckhut Augustine, Alison M
Project Start
1993-07-01
Project End
2002-06-30
Budget Start
2000-07-01
Budget End
2001-06-30
Support Year
9
Fiscal Year
2000
Total Cost
$245,467
Indirect Cost
Name
Indiana University-Purdue University at Indianapolis
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
005436803
City
Indianapolis
State
IN
Country
United States
Zip Code
46202
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