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The Journal of Immunology, Vol 156, Issue 8 2828-2839, Copyright © 1996 by American Association of Immunologists
ARTICLES |
JS Michaelson, M Singh, CM Snapper, WC Sha, D Baltimore and BK Birshtein
Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Targeted disruption of the p50 subunit of NF-kappa B resulted in isotype class switch defects resembling those observed in mice in which the downstream IgH enhancer 3'alpha E(hs1,2) was deleted. We postulated that kappa B binding proteins may regulate class switching by interacting with 3'alpha E(hs1,2) or with other IgH 3' enhancers with which 3'alpha E(hs1,2) synergizes. kappa B binding sites were identified in 3'alpha E(hs1,2) and 3' alpha-hs4, the distal 3' IgH enhancer. A kappa B binding site within 3'alpha E(hs1,2) contributes to at least half the activity of the enhancer in plasma cells, while the same kappa B binding site participates in the complex repression of the enhancer in B cells. In the case of 3'alpha-hs4, a kappa B binding complex activates the enhancer in pre-B, B cells and plasma cells. Additional binding sites within 3'alpha-hs4 for factors known to regulate 3'alpha E(hs1,2), including Oct-1 and BSAP, were identified, and their contribution to 3'alpha-hs4 regulation during B cell development was assessed. Oct-1 positively regulates the enhancer in pre-B and B cells, while BSAP is a repressor in pre-B cells and an activator at the B cell stage. These studies identify kappa B binding proteins as key modulators of 3'alpha E(hs1,2) and 3'alpha-hs4, and suggest coregulation of the two enhancers by a common set of factors.
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