With a long-term objective to understand the developmental stages of the B cell response to antigen, this research will focus on germinal center and memory B cells, which relate to the cardinal features of immunity, affinity maturation of the immune response and immunological memory.
The specific aims are to determine: 1) the role of heparan sulfate/heparin in serving as a ligand for CD19 in the germinal center; 2) whether developmental down-regulation of SHP-1 in the germinal center B cell is required, and whether this permits signaling through a gamma-c cytokine receptor; 3) whether arrested terminal differentiation by BCL-6 is the basis for B cell memory; 4) whether signaling through a gamma-c, cytokine receptor is necessary to maintain memory B cells; and 5) whether B cells with dysregulated c-myc present as centroblast-like Burkitt lymphomas because of unique expression patterns of BCL-6 and SHP-l at this stage of development.
For Aims 2 -5, mice will be created in which transgenes can be inducibly expressed in a lineage-specific manner. A bacterially-derived transactivator transgene, rtTA, will be expressed only in B cells and will drive transcription of """"""""target"""""""" transgenes in the presence of doxycycline. The target transgenes are SHP-1, dominant negative (DN) gamma-c, and wild-type and DN BCL6, all linked via an IRES to EGFP to permit visualization of transgene expression. With doubly transgenic, Fl mice, giving doxycycline will 1) up-regulate SHP-1 and DN gamma-c in germinal center B cells, allowing analysis of the role of low SHP-1 and cytokine receptor signaling in these cells; and 2) up-regulate DN gamma-c, and wild-type and DN BCL-6 in memory B cells, allowing analysis of the role of BCL-6 and cytokine receptor signaling in these cells. The understanding gained from these studies of normal B cell development will be applied to a murine model of Burkitt lymphoma to discover why translocation of c-myc at an early stage of B cell development leads to a B cell tumor at a much later stage.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI050591-02
Application #
6660706
Study Section
Immunobiology Study Section (IMB)
Program Officer
Mallia, Conrad M
Project Start
2002-09-20
Project End
2007-06-30
Budget Start
2003-07-01
Budget End
2004-06-30
Support Year
2
Fiscal Year
2003
Total Cost
$270,000
Indirect Cost
Name
University of Cambridge
Department
Type
DUNS #
226552610
City
Cambridge
State
Country
United Kingdom
Zip Code
CB2 1-TN