This project aims to identify and dissect important biochemical functions in antigen processing for presentation by class II MHC molecules (MHC-II). In particular, we are interested in the functions contributed by particular subcellular organelles, endosomes and lysosomes, which we can separate by subcellular fractionation. Preliminary evidence indicates that a lysosomal compartment appears to contribute to antigen processing. We hope to further define the characteristics of these organelles and to define the patterns of transport of MHC-II molecules to and from them. We will attempt to localize the compartment that mediates the formation of peptide-MHC-II complexes, using subcellular fractionation coupled with biochemical or immunological (T cell) assays to quantitate peptide binding to MHC-II. We hope to define the role of invariant chain and other possible accessory molecules in targeting MHC-II into a productive antigen processing pathway. These studies should provide important advances in our understanding of the basic mechanisms of antigen processing that determine antigenicity and immune recognition. These principles are important to aa wide range of problems in clinical immunology, including vaccination for infectious disease, therapy for autoimmunity or immunodeficiency, or enhancing immune responses to tumor cells to combat cancer.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI035726-05
Application #
2653842
Study Section
Immunobiology Study Section (IMB)
Project Start
1994-05-01
Project End
1999-01-31
Budget Start
1998-02-01
Budget End
1999-01-31
Support Year
5
Fiscal Year
1998
Total Cost
Indirect Cost
Name
Case Western Reserve University
Department
Pathology
Type
Schools of Medicine
DUNS #
077758407
City
Cleveland
State
OH
Country
United States
Zip Code
44106
Simmons, Daimon P; Wearsch, Pamela A; Canaday, David H et al. (2012) Type I IFN drives a distinctive dendritic cell maturation phenotype that allows continued class II MHC synthesis and antigen processing. J Immunol 188:3116-26
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Mahon, Robert N; Sande, Obondo J; Rojas, Roxana E et al. (2012) Mycobacterium tuberculosis ManLAM inhibits T-cell-receptor signaling by interference with ZAP-70, Lck and LAT phosphorylation. Cell Immunol 275:98-105
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Ramachandra, Lakshmi; Qu, Yan; Wang, Ying et al. (2010) Mycobacterium tuberculosis synergizes with ATP to induce release of microvesicles and exosomes containing major histocompatibility complex class II molecules capable of antigen presentation. Infect Immun 78:5116-25
Simmons, Daimon P; Canaday, David H; Liu, Yi et al. (2010) Mycobacterium tuberculosis and TLR2 agonists inhibit induction of type I IFN and class I MHC antigen cross processing by TLR9. J Immunol 185:2405-15
Reuter, Morgan A; Pecora, Nicole D; Harding, Clifford V et al. (2010) Mycobacterium tuberculosis promotes HIV trans-infection and suppresses major histocompatibility complex class II antigen processing by dendritic cells. J Virol 84:8549-60
Harding, Clifford V; Boom, W Henry (2010) Regulation of antigen presentation by Mycobacterium tuberculosis: a role for Toll-like receptors. Nat Rev Microbiol 8:296-307

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