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- W2033075462 abstract "The prodynorphin gene contains several kappa B motifs, suggesting that kappa B-specific DNA-binding factors may regulate its expression. Prodynorphin is known to be expressed in human tumor cell lines [Geiger et al., Regul. Peptides, 34 (1991) 181-188] and we report here that several DNA-binding factors of the NF-kappa B/c-Rel-family are present in the same cells. Three main kappa B-specific factors, presumably a p50 homodimer, NF-kappa B which is a p50/p65 heterodimer and a p65/c-Rel heterodimer were identified using an electromobility shift assay (EMSA), immunoabsorption and UV cross-linking experiments. Minor factors consisting of a novel kappa B-specific protein of about 125 kDa (p125) or being hetero-oligomeric, composed of p125 and either of three other subunits, namely p50, p65 and c-Rel, were also identified. The homo-oligomer of p125 may be identical to the kappa B-specific factor BETA, previously found only in brain [Korner et al., Neuron, 3 (1989) 563-572]. Comparison of prodynorphin mRNA levels with levels of the kappa B-specific DNA-binding factors revealed a negative correlation with the level of p50 homodimer, and a positive correlation with the ratio of the levels of p65/c-Rel to NF-kappa B. No association was found with proenkephalin mRNA levels which were significant in only one cell line. The p50 homodimer, but not p65/c-Rel and NF-kappa B, bound specifically to a DNA-motif within the dynorphin A-encoding gene sequence. This sequence is located in exon 4 and similar to the consensus kappa B-sequence. The dynorphin A-encoding sequence may represent an intragenic target for the p50 homodimer, which when bound to the sequence suppresses transcription." @default.
- W2033075462 created "2016-06-24" @default.
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- W2033075462 date "1994-07-01" @default.
- W2033075462 modified "2023-10-02" @default.
- W2033075462 title "Prodynorphin gene expression relates to NF-κB factors" @default.
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- W2033075462 doi "https://doi.org/10.1016/0169-328x(94)90143-0" @default.
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