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- W1993377279 abstract "Bacterial DNA and CpG-oligodeoxyribonucleotides (ODN) are powerful B cell activators, inducing apoptosis protection, cell cycle entry, proliferation, costimulatory molecule expression, immunoglobulin (Ig) and interleukin-6 (IL-6) secretion. However, proximal events in B cell activation by ODN are only partially characterized, including the translocation of NF-kappaB to the nucleus. In this paper, we provide evidence that CpG-ODN-induced cell cycle entry and apoptosis protection are blocked by SN50 or gliotoxin and thus require NF-kappaB activation. NF-kappaB activation occurred within 30 minutes of stimulation of murine B cells with a phosphorothioate (S) CpG-ODN and persisted for up to 40 hours, with p50, p65, and c-Rel as the major components. Similar to other NF-kappaB inducers, CpG-ODN caused an early IkappaBalpha and IkappaBbeta degradation plus cleavage of the p50 precursor and subsequent NF-kappaB nuclear translocation. A group of closely related S-ODN, which specifically blocked CpG-induced B cell activation at submicromolar concentrations, also prevented NF-kappaB DNA binding and transcriptional activation. These inhibitory S-ODN differed from stimulatory S-ODN by having 2-3 G substitutions in the central motif. As inhibitory S-ODN did not directly interfere with the NF-kappaB DNA binding but prevented CpG-induced NF-kappaB nuclear translocation of p50, p65, and c-Rel and blocked p105, IkappaBalpha, and IkappaBbeta degradation, we concluded that their putative target must lie upstream of inhibitory kinase (IKK) activation." @default.
- W1993377279 created "2016-06-24" @default.
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- W1993377279 date "2001-08-01" @default.
- W1993377279 modified "2023-09-25" @default.
- W1993377279 title "CpG Stimulation of Primary Mouse B Cells Is Blocked by Inhibitory Oligodeoxyribonucleotides at a Site Proximal to NF-<i>κ</i>B Activation" @default.
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- W1993377279 doi "https://doi.org/10.1089/108729001317022241" @default.
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