The proposed research will describe the murine complement receptor Cr2. This gene produces two related proteins whose primary functions have been described as receptors for opsonized fragments of complement. During a viral or bacterial infection, the complement pathway is engaged to both lyse the invading pathogen as well as to coat the surface with protein subunits derived primarily from the C3 product. These bound protein fragments can then be recognized by a variety of different receptor chains to internalize and hopefully neutralize the pathogen. This pathway, however, can be exploited by pathogens such as HIV which can essentially hijack the complement pathway to gain entry into cells for which they lack the appropriate receptor. We plan to focus upon two related aspects of the gene and gene products. First is to describe those genetic control sequences which promote the expression of Cr2 in murine B cells and follicular dendritic cells and inhibit its expression in virtually all other cell types. This question will be approached by creating a variety of genetic constructs and analyzing them using both in vitro and in vivo techniques. The second phase of the research is to determine the role of the Cr2 proteins in the acquisition of an immune response to invading pathogens. These experiments will focus upon the role of the Cr2 chains to promote the uptake of antigen by B cells and the role of the protein on the follicular dendritic cell. The biological information we obtain from these studies should just as amenable to understanding the function(s) of human CR2 as the murine protein.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI024158-10
Application #
2330327
Study Section
Allergy and Immunology Study Section (ALY)
Project Start
1986-12-01
Project End
2001-01-31
Budget Start
1997-02-01
Budget End
1998-01-31
Support Year
10
Fiscal Year
1997
Total Cost
Indirect Cost
Name
University of Utah
Department
Pathology
Type
Schools of Medicine
DUNS #
City
Salt Lake City
State
UT
Country
United States
Zip Code
84112
Donius, Luke R; Orlando, Christopher M; Weis, Janis J et al. (2014) Generation of a novel Cr2 gene allele by homologous recombination that abrogates production of Cr2 but is sufficient for expression of Cr1. Immunobiology 219:53-63
Pioli, Peter D; Debnath, Irina; Weis, Janis J et al. (2014) Zfp318 regulates IgD expression by abrogating transcription termination within the Ighm/Ighd locus. J Immunol 193:2546-53
Pioli, Peter D; Weis, John H (2014) Snail transcription factors in hematopoietic cell development: a model of functional redundancy. Exp Hematol 42:425-30
Donius, Luke R; Weis, Janis J; Weis, John H (2014) Murine complement receptor 1 is required for germinal center B cell maintenance but not initiation. Immunobiology 219:440-9
Debnath, Irina; Roundy, Kirstin M; Pioli, Peter D et al. (2013) Bone marrow-induced Mef2c deficiency delays B-cell development and alters the expression of key B-cell regulatory proteins. Int Immunol 25:99-115
Pioli, Peter D; Dahlem, Timothy J; Weis, Janis J et al. (2013) Deletion of Snai2 and Snai3 results in impaired physical development compounded by lymphocyte deficiency. PLoS One 8:e69216
Donius, Luke R; Handy, Jennifer M; Weis, Janis J et al. (2013) Optimal germinal center B cell activation and T-dependent antibody responses require expression of the mouse complement receptor Cr1. J Immunol 191:434-47
Dahlem, Timothy; Cho, Scott; Spangrude, Gerald J et al. (2012) Overexpression of Snai3 suppresses lymphoid- and enhances myeloid-cell differentiation. Eur J Immunol 42:1038-43
Bramwell, Kenneth K C; Ma, Ying; Weis, John H et al. (2012) High-throughput genotyping of advanced congenic lines by high resolution melting analysis for identification of Bbaa2, a QTL controlling Lyme arthritis. Biotechniques 52:183-90
Lochhead, Robert B; Sonderegger, F Lynn; Ma, Ying et al. (2012) Endothelial cells and fibroblasts amplify the arthritogenic type I IFN response in murine Lyme disease and are major sources of chemokines in Borrelia burgdorferi-infected joint tissue. J Immunol 189:2488-501

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