The broad, long-term objective of the proposed research is to characterize antigen processing and presentation pathways in dendritic cells (DC), and how these relate to their function in initiating and regulating immune responses. The proposed research is intended to determine the location within DC where peptide and protein-derived antigens are loaded onto class II MHC proteins, and how this is regulated by dendritic cell maturation;to determine the molecular basis for the lack of loading of empty class II MHC proteins present in immature DC;to evaluate possible functional roles for empty class II MHC molecules;and to determine structural characteristics of the peptide-free open conformation of HLA-DR1. These goals will be achieved using cellular and biochemical assays to follow the occupancy and peptide binding activity of class II MHC proteins in antigen presenting cells in different developmental states, and using cellular and immunological assays to follow the functional outcomes of antigen presentation. A novel fluorometric probe of peptide binding has been developed for this purpose. PROJECT NARRATIVE: Antigen presentation by dendritic cells plays a key role in the process by which the immune system recognizes and responds to pathogens. A detailed understanding of the basic cellular processes responsible for antigen presentation will be important to guide therapeutic approaches to regulating inappropriate immune responses as in autoimmunity and allergy, and for efforts to develop new vaccines and to improve existing vaccines against infectious agents and cancer.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI048833-11
Application #
8213513
Study Section
Cellular and Molecular Immunology - A Study Section (CMIA)
Program Officer
Gondre-Lewis, Timothy A
Project Start
2001-01-29
Project End
2014-01-31
Budget Start
2012-02-01
Budget End
2014-01-31
Support Year
11
Fiscal Year
2012
Total Cost
$398,166
Indirect Cost
$153,141
Name
University of Massachusetts Medical School Worcester
Department
Pathology
Type
Schools of Medicine
DUNS #
603847393
City
Worcester
State
MA
Country
United States
Zip Code
01655
Yin, Liusong; Trenh, Peter; Guce, Abigail et al. (2014) Susceptibility to HLA-DM protein is determined by a dynamic conformation of major histocompatibility complex class II molecule bound with peptide. J Biol Chem 289:23449-64
Mellins, Elizabeth D; Stern, Lawrence J (2014) HLA-DM and HLA-DO, key regulators of MHC-II processing and presentation. Curr Opin Immunol 26:115-22
Yin, Liusong; Stern, Lawrence J (2014) A novel method to measure HLA-DM-susceptibility of peptides bound to MHC class II molecules based on peptide binding competition assay and differential IC(50) determination. J Immunol Methods 406:21-33
Yin, Liusong; Stern, Lawrence J (2014) Measurement of Peptide Binding to MHC Class II Molecules by Fluorescence Polarization. Curr Protoc Immunol 106:5.10.1-5.10.12
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Painter, Corrie A; Negroni, Maria P; Kellersberger, Katherine A et al. (2011) Conformational lability in the class II MHC 310 helix and adjacent extended strand dictate HLA-DM susceptibility and peptide exchange. Proc Natl Acad Sci U S A 108:19329-34
Clement, Cristina C; Cannizzo, Elvira S; Nastke, Maria-Dorothea et al. (2010) An expanded self-antigen peptidome is carried by the human lymph as compared to the plasma. PLoS One 5:e9863
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Painter, Corrie A; Cruz, Anthony; Lopez, Gustavo E et al. (2008) Model for the peptide-free conformation of class II MHC proteins. PLoS One 3:e2403
Chitta, Sriram; Santambrogio, Laura; Stern, Lawrence J (2008) GMCSF in the absence of other cytokines sustains human dendritic cell precursors with T cell regulatory activity and capacity to differentiate into functional dendritic cells. Immunol Lett 116:41-54

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