During FY13, we accomplished the following: 1) Continued analysis of P3 and P4 populations to understand the basis for stimulus-independent cell-cycle progression of P4 cells. RNA from purified P3/P4 cells were examined by microarrays and whole cell extracts were probed for cell-cycle associated proteins. Immunoprecipitation studies to identify APC-associated proteins are underway. We also utilized new DNA synthesis marker EdU to precisely define the cell cycle status of P3 and P4 populations. These studies have led to a fuller characterization of these cell populations. Additionally, we investigated whether all forms of B cell stimulation resulted in cells with similar characteristics. We found that P3/P4 equivalent cells present after LPS stimulation behaved similarly to P3/P4 cells generated after treatment with anti-CD40. That is, only P4 cells continued to divide in the absence of additional stimulation. However, both P3 and P4 populations obtained after anti-Ig treatment proliferated without additional stimulation. 2) Generated stable transfectants in BJAB cells to test the hypothesis that NF-κB-dependent promoters communicate with 3UTRs to regulate mRNA lifetime of target genes. 3) Identified long intergenic non-coding RNAs that were induced in response to BCR signaling. 4) Collaborated with Ananda Roy (Tufts University Medical School) and Ali Shilatifard (Stowers Institute) to map the genome-wide H3K4me3 and H3K27me3 status in naive B cells, and cells activated via the BCR and by LPS after short-term treatment (30 min and 2h). This time-course was designed to study immediate-early gene expression in response to defined stimuli.

National Institute of Health (NIH)
National Institute on Aging (NIA)
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National Institute on Aging
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Lee-Chang, Catalina; Bodogai, Monica; Moritoh, Kanako et al. (2016) Aging Converts Innate B1a Cells into Potent CD8+ T Cell Inducers. J Immunol 196:3385-97
Kaileh, Mary; Vazquez, Estefania; MacFarlane 4th, Alexander W et al. (2016) mTOR-Dependent and Independent Survival Signaling by PI3K in B Lymphocytes. PLoS One 11:e0146955
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Kaileh, Mary; Sen, Ranjan (2012) NF-ýýB function in B lymphocytes. Immunol Rev 246:254-71
Olkhanud, Purevdorj B; Damdinsuren, Bazarragchaa; Bodogai, Monica et al. (2011) Tumor-evoked regulatory B cells promote breast cancer metastasis by converting resting CD4⁺ T cells to T-regulatory cells. Cancer Res 71:3505-15
Sen, Ranjan (2011) The origins of NF-κB. Nat Immunol 12:686-8
Fowler, Trent; Sen, Ranjan; Roy, Ananda L (2011) Regulation of primary response genes. Mol Cell 44:348-60
Kaileh, Mary; Sen, Ranjan (2010) Role of NF-kappaB in the anti-inflammatory effects of tocotrienols. J Am Coll Nutr 29:334S-339S
Damdinsuren, Bazarragchaa; Zhang, Yongqing; Khalil, Ashraf et al. (2010) Single round of antigen receptor signaling programs naive B cells to receive T cell help. Immunity 32:355-66

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