Tumor necrosis factor alpha regulates expression of the major histocompatibility complex class II-associated invariant chain by binding of an NF-kappa B-like factor to a promoter element.

Molecular and Cellular Biology
U Pessara, N Koch

Abstract

Expression of the major histocompatibility complex (MHC) class I and class II antigens and the class II-associated invariant chain (Ii) is strongly increased by treatment of cells with tumor necrosis factor alpha (TNF-alpha) and gamma interferon. We investigated elevation of expression of the invariant chain gene by TNF-alpha. Rat fibroblast cells transfected with the mouse Ii gene containing 802 base pairs of 5' sequences could be stimulated for Ii expression by treatment with TNF-alpha. Analysis of 5'-deleted Ii gene promoter-CAT constructs provided evidence for the presence of a TNF-alpha response box (TRB). Cloning of TRB in front of a non-TNF-alpha-responsive promoter could transfer the TNF-alpha stimulatory effect. We demonstrate binding of a TNF-alpha-induced factor to a kappa B-like motif within TRB. Mutations introduced into the kappa B element of the Ii promoter-CAT plasmid abolished the TNF-alpha-mediated stimulatory effect. Comparison of the TNF-alpha-induced factor and lipopolysaccharide-induced NF-kappa B in gel mobility shift assays upon partial protease digestion suggests similar DNA-binding protein cores. Further support for the NF-kappa B-like nature of the TNF-alpha-induced factor was obtained in methylation ...Continue Reading

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