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.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Project (R01)
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Cellular and Molecular Immunology - A Study Section (CMIA)
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Gondre-Lewis, Timothy A
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University of Massachusetts Medical School Worcester
Schools of Medicine
United States
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Clement, Cristina C; Wang, Wei; Dzieciatkowska, Monika et al. (2018) Quantitative Profiling of the Lymph Node Clearance Capacity. Sci Rep 8:11253
Clement, Cristina C; Becerra, Aniuska; Yin, Liusong et al. (2016) The Dendritic Cell Major Histocompatibility Complex II (MHC II) Peptidome Derives from a Variety of Processing Pathways and Includes Peptides with a Broad Spectrum of HLA-DM Sensitivity. J Biol Chem 291:5576-95
Clement, Cristina C; Moncrieffe, Halima; Lele, Aditi et al. (2016) Autoimmune response to transthyretin in juvenile idiopathic arthritis. JCI Insight 1:
Yin, Liusong; Stern, Lawrence J (2014) Measurement of Peptide Binding to MHC Class II Molecules by Fluorescence Polarization. Curr Protoc Immunol 106:5.10.1-12
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; 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
Santambrogio, Laura; Stern, Lawrence J (2013) Carrying yourself: self antigen composition of the lymphatic fluid. Lymphat Res Biol 11:149-54
Yin, Liusong; Stern, Lawrence J (2013) HLA-DM Focuses on Conformational Flexibility Around P1 Pocket to Catalyze Peptide Exchange. Front Immunol 4:336
Guce, Abigail I; Mortimer, Sarah E; Yoon, Taejin et al. (2013) HLA-DO acts as a substrate mimic to inhibit HLA-DM by a competitive mechanism. Nat Struct Mol Biol 20:90-8

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