Mtb uptake and antigen presentation in human lung epithelial cells

人肺上皮细胞中结核分枝杆菌的摄取和抗原呈递

• 批准号: 8595290
• 负责人: Melanie J Harriff
• 金额: --
• 依托单位: PORTLAND VA MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8595290
• 关键词: Address; Afghanistan; Antigen Presentation; Antigen Presentation Pathway; Antigen-Presenting Cells; Antigens; Bacteria; CD4 Positive T Lymphocytes; CD8B1 gene; Cause of Death; Cells; Communicable Diseases; Containment; Dendritic Cells; Development; Diagnostic; Disease; Early Diagnosis; Epithelial Cells; Epithelium; Event; Exposure to; General Population; Goals; Histocompatibility Antigens Class I; Human; Immune response; Immune system; In Vitro; Incidence; Infection; Infection Control; Iraq; Kinetics; Laboratories; Libraries; Life; Lung; Lung diseases; Maintenance; Mission; Monitor; Morbidity - disease rate; Mucosal Immunity; Mucous Membrane; Mycobacterium smegmatis; Mycobacterium tuberculosis; Mycobacterium tuberculosis antigens; Organism; Pathway interactions; Patient Care; Patients; Phagocytes; Phagosomes; Play; Proteins; Research; Role; T-Lymphocyte; Time; Tuberculosis; Tuberculosis Vaccines; Vaccine Therapy; Vaccines; Veterans; antigen processing; arm; design; direct application; disorder control; improved; latent infection; macrophage; member; monocyte; mortality; pathogen; protein transport; response; small hairpin RNA; trafficking; uptake

DESCRIPTION (provided by applicant): Tuberculosis remains an important cause of infectious disease morbidity and mortality worldwide, and is a problem of particular concern to those in the armed forces. The organism that causes tuberculosis, Mycobacterium tuberculosis (Mtb), is an intracellular pathogen. Improved definition of those mechanisms by which the immune system recognizes intracellular infection provides direct application to improved vaccines and diagnostics. In this proposal, we will define the mechanisms by which human lung epithelial cells take up Mtb and the pathways by which Mtb antigens are processed and presented in the context of the MHC Class I molecule, MR1, to lung resident CD8+ T cells known as MAIT cells (mucosal-associated invariant T cells). Although the lung epithelium is the first line of defense against infection with Mtb, very little is known about the mechanisms of uptake and antigen presentation by epithelial cells to innate T cells. Improving our understanding of this interaction will be critical to rational design of better vaccines to serve the VA patient mission. To define the mechanisms by which human lung epithelial cells are taken up, we will perform a detailed analysis of the Mtb compartment in human epithelial cells in vitro, with regard to proteins known to be associated with uptake, vesicular trafficking, and antigen processing and presentation. To characterize the role that the epithelial cell Mtb compartment plays in MR1 antigen presentation, we will perform a detailed analysis of MR1 with regard to its cellular localization, association with the Mtb compartment, and antigen processing and presentation pathways. Our hypothesis is that Mtb is taken up by epithelial cells into compartments that are distinct from phagosomes of professional antigen presenting cells, and that trafficking of and presentation of antigen on MR1 are requisite steps in initiation and maintenance of Mtb-specific mucosal immunity.

描述（由申请人提供）：