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The lysozyme gene is expressed at a low level in myeloblasts and is progressively activated to constitutively high expression in mature macrophages. The binding activity of the newly defined NF-kappa B/Rel family of transcription factors increases during the terminal differentiation of macrophages. In this study, I show that NF-kappa B/Rel-like proteins bind to the nuclear factor kappa B (kappa B)-like sequence of the lysozyme promoter. These binding activities were induced by treatment of HD11 cells with lipopolysaccharide. Immunomobility shift assays show that c-Rel is possibly a factor in the complexes that bind to the kappa B-like sequence lys kappa B. Binding activity to one of the protein complexes seems to be regulated by phosphorylation. In fact, overexpression of p65 and c-Rel stimulates expression of the chloramphenicol acetyltransferase gene controlled by the lysozyme promoter. Furthermore, co-transfection experiments reveal that the kappa B-like sequence within the lysozyme promoter mediates the transactivation by p65 and c-Rel. These results indicate that the p65 and c-Rel could be components of the protein complexes that bind to the kappa B-like sequence and this binding could contribute to the progressively activated expression of the lysozyme gene during the terminal differentiation of macrophages.

Transcriptional activation of the chicken lysozyme gene by NF-κ Bp65 (RelA) and c-Rel, but not by NF-κ Bp50