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osu1061213266.pdf (1.82 MB)
ETD Abstract Container
Abstract Header
Role for cyclic adenosine monophosphate (cAMP) response element binding proteins in B lymphocyte development and functional maturation
Author Info
Chen, Hui-Chen
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1061213266
Abstract Details
Year and Degree
2003, Doctor of Philosophy, Ohio State University, Medical Microbiology and Immunology.
Abstract
Cyclic adenosine 5’ monophosphate (cAMP) response element binding protein-1 (CREB-1) belongs to the CREB/ATF leucine zipper family of transcription factors. CREB-1 is expressed in pro-B, pre-B, immature and mature B cells. Activation through the antigen receptor or CD40 molecule, but not with bacterial lipopolysaccharide, a B cell mitogen, results in time dependent phosphorylation of CREB-1 at Ser
119/133
. CREB-1 has been implicated in the regulation of antigen receptor induced B cell activation and cytokine signaling. Taken these evidences together, we hypothesized a potential role for CREB-1 in B cell development and functional maturation
in vivo
. To test this hypothesis, transgenic mice over expressing a dominant negative Ser
119-ala
phosphomutant CREB-1 (mCREB-1) in B cells were generated. Analysis of these mice revealed reduced B220+IgM+ mature B cells associated with a block in pre-BI (CD43
+
B220
+
CD24
+(int)
) to pre-BII (CD43
+
B220
+
CD24
++(high)
) transition resulting in the accumulation of pre-BI cells and decreased pre-BII, immature and mature B cells in the bone marrow. Over expression of either Bcl-2 or Bcl-xL transgenes in the mCREB-1 transgenic mice failed to rescue the B cell developmental defects. The decreased pre-BII B cell expansion in mCREB-1 transgenic mice is attributed to deregulated expression of c-Jun and JunB associated with decreased cell cycle entry from the G0/G1 phase to the S phase. More importantly, the transgenic pre-BII B cells failed to enter S phase in response to stimulation with IL-7
in vitro
. In addition to the defects in the bone marrow, the transgenic mice exhibited decreased follicular B cells in the spleen and increased B1a and B1b B cell populations in the peritoneum. Further, while exhibiting normal antibody responses to T-independent antigens, defective secondary immune responses to T-dependent antigen was observed in the transgenic mice suggesting a role for CREB-1 in T-dependent immune responses.
In vitro
and
in vivo
CFSE labeling studies indicated that the increased B1 B cells were not due to altered proliferation of transgenic peritoneal B cells. Further, reconstitution analysis in recombination activation gene-2 (Rag-2) deficient recipients indicated that the increased B1 B cells in the peritoneum were attributed to neither the defective bone marrow cells nor fetal liver cells. Interestingly, the transgenic mice revealed decreased B1a B cell population in the spleen. Consistent with the increased B1 B cells, the mutant CREB-1 transgenic mice revealed increased serum IgM levels compared to wild type control littermates. These studies provide the first evidence of a role for CRE binding proteins in the differential regulation of B1 and B2 B cell development and functional maturation.
Committee
Natarajan Muthusamy (Advisor)
Subject Headings
Health Sciences, Immunology
Keywords
CREB-1
;
B lymphocytes
;
B1 B cells
;
B2 B cells
;
Immune response
;
B cell development
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Chen, H.-C. (2003).
Role for cyclic adenosine monophosphate (cAMP) response element binding proteins in B lymphocyte development and functional maturation
[Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1061213266
APA Style (7th edition)
Chen, Hui-Chen.
Role for cyclic adenosine monophosphate (cAMP) response element binding proteins in B lymphocyte development and functional maturation.
2003. Ohio State University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1061213266.
MLA Style (8th edition)
Chen, Hui-Chen. "Role for cyclic adenosine monophosphate (cAMP) response element binding proteins in B lymphocyte development and functional maturation." Doctoral dissertation, Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1061213266
Chicago Manual of Style (17th edition)
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Document number:
osu1061213266
Download Count:
769
Copyright Info
© 2003, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.