This laboratory and colleagues demonstrated that Group 1 CD1a, b and c antigen presenting molecules present lipid and glycolipid microbial antigens to T cells. In order to determine the nature of the immune response to M. tb antigens following virulent infection, we have established a guinea pig model of aerosol infection with the virulent H37Rv strain of M. tb. We cloned the guinea pig CD1 genes, expressed them in transfectant cells, and identified anti-guinea pig CD1 specific mAb that allow characterization of CD1 immune responses in guinea pigs. Following infection in guinea pigs, we will determine the pattern of expression of CD1 in lymphoid organs and relevant sites of infection. We will identify the immunodominant M. tb lipid antigens that activate T cell responses and the CD1 isoforms that mediate their presentation. These data will provide valuable information for the testing of immunodominant lipid fractions as vaccine candidates. We hypothesize that antigen presentation by CD1 will elicit T cells that add a distinct component of cellular immunity against microbes that is missing in vaccine formulations that contain or encode only protein antigens. Therefore, we propose to combine immunodominant CD1 presented lipid antigens with MHC presented protein antigens in a combination subunit vaccine to elicit a composite immune response. Together, these studies will move forward our understanding of the basic biology of CD1 antigen presentation during microbial infection in vivo with applications of this emerging biology to vaccine development.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
1R01AI048932-01
Application #
6291213
Study Section
Special Emphasis Panel (ZAI1-MSQ-I (S3))
Program Officer
Ash-Shaheed, Belinda
Project Start
2000-05-01
Project End
2005-04-30
Budget Start
2000-05-01
Budget End
2001-04-30
Support Year
1
Fiscal Year
2000
Total Cost
$180,196
Indirect Cost
Name
Brigham and Women's Hospital
Department
Type
DUNS #
071723621
City
Boston
State
MA
Country
United States
Zip Code
02115
Xiong, Xiaowei; Morita, Craig T; Bukowski, Jack F et al. (2004) Identification of guinea pig gammadelta T cells and characterization during pulmonary tuberculosis. Vet Immunol Immunopathol 102:33-44
Cernadas, Manuela; Sugita, Masahiko; van der Wel, Nicole et al. (2003) Lysosomal localization of murine CD1d mediated by AP-3 is necessary for NK T cell development. J Immunol 171:4149-55
Brigl, Manfred; Bry, Lynn; Kent, Sally C et al. (2003) Mechanism of CD1d-restricted natural killer T cell activation during microbial infection. Nat Immunol 4:1230-7
Dascher, Christopher C; Hiromatsu, Kenji; Xiong, Xiaowei et al. (2002) Conservation of CD1 intracellular trafficking patterns between mammalian species. J Immunol 169:6951-8