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- _4 wasQuotedFrom 18363837 provenance.
- _4 value "TNF-alpha-induced increase in MLCK promoter activity was mediated by NF-kappaB activation. There were eight kappaB binding sites on MLCK promoter. The NF-kappaB1 site at +48 to +57 mediated TNF-alpha-induced increase in MLCK promoter activity. The NF-kappaB2 site at -325 to -316 had a repressive role on promoter activity. The opposite effects on promoter activity were due to differences in the NF-kappaB dimer type binding to the kappaB sites. p50/p65 dimer preferentially binds to the NF-kappaB1 site and up-regulates promoter activity; while p50/p50 dimer preferentially binds to the NF-kappaB2 site and down-regulates promoter activity." provenance.