Activation of the Interleukin-6 promoter by a dominant negative mutant of c-Jun

The human IL-6 promoter contains multiple regulatory elements such as those binding transcription factors belonging to the NF-kB (–75/–63), C/EBP (-158/-145 and -87/–76) and AP-1 (–283/-277) families. Herein, we report that ectopic expression of c-Jun, C/EBPdelta, and the p65 subunit of NF-kB synergistically activates an IL-6 promoter construct containing only a TATA box and an kB binding site. These results suggest that interactions among NF-kB, C/EBP, and AP-1, which are all activated by the most powerful physiological inducers of the IL-6 gene, namely TNF-alpha and IL-1, may be crucial for maximal activation of the IL-6 promoter in response to the two cytokines. Furthermore, we show that a mutated form of c-Jun lacking the transactivation domain (TAM-67) was a much stronger activator of the IL-6 promoter than c-Jun. In combination with p65 and/or C/EBPdelta, TAM-67 also synergistically activated the IL-6 promoter, while it inhibited TNF-alpha induced AP-1 activity directing an AP-1-responsive reporter plasmid. Lastly, EMSA results strongly suggest the formation of complexes between p65, C/EBPdelta, and/or c-Jun or TAM-67 on the kB site supporting the idea that the functional synergism is determined by a physical interaction. These data provide new insight into the molecular mechanisms regulating the formation of the transcription complex responsible for IL-6 promoter activation.