Hsp90α recruited by Sp1 is important for transcription of 12(S)-lipoxygenase in A431 cells

Jan Jong Hung, Chih Ying Wu, Pao Chi Liao, Wen Chang Chang

研究成果: 雜誌貢獻文章同行評審

23 引文 斯高帕斯(Scopus)


Sp1 is a basic transcriptional factor that binds to the GC-rich region in the promoter of the target gene. It is involved in transcription of numerous genes by recruiting transcriptional factors to the promoters of target genes. In this study, we found in vivo and in vitro that Hsp90α was recruited to the GC-rich region of the 12(S)-lipoxygenase promoter through interaction with Sp1 in A431 cells by employing DNA affinity immunoprecipitation assay and chromatin immunoprecipitation assay. When Hsp90α was inhibited by geldanamycin (GA, a specific inhibitor of the Hsp90 family) or by siRNA of Hsp90α (to block its activity or to knockdown protein levels), respectively, luciferase activity (driven by the 12(S)-lipoxygenase promoter) and both mRNA and protein levels of 12(S)-lipoxygenase were reduced significantly in cells. In addition, the effect of GA was abolished when the Sp1 binding sites of 12(S)-lipoxygenase were mutated in A431 cells. Interestingly, binding of Sp1 to the 12(S)-lipoxygenase promoter was also decreased upon GA treatment in cells. In conclusion, our results indicate that Sp1 interacts with Hsp90α to recruit it to the promoter of 12(S)-lipoxygenase and then to regulate gene transcription by modulating the binding ability of Sp1 to promoters.

頁(從 - 到)36283-36292
期刊Journal of Biological Chemistry
出版狀態已發佈 - 10月 28 2005

ASJC Scopus subject areas

  • 生物化學
  • 分子生物學
  • 細胞生物學


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