Interferon-gamma-induced expressions of heat shock protein 60 and heat shock protein 10 in C6 astroglioma cells: identification of the signal transducers and activators of transcription 3-binding site in bidirectional promoter.
Heat shock protein 60 and heat shock protein 10 are mitochondrial chaperonin proteins. Here, we report that the expressions of heat shock protein 60 and heat shock protein 10 were upregulated in interferon-gamma-treated C6 astroglioma cells, and the 582 bp in the bidirectional promoter of the heat shock protein 60 and heat shock protein 10 genes is responsible for interferon-gamma-induced induction. The induction of heat shock protein 60 and heat shock protein 10 by interferon-gamma was virtually abolished by introducing mutations into the putative signal transducers and activators of transcription 3-response element in the promoter, and the same mutation impaired increment of the signal transducers and activators of transcription 3-binding after interferon-gamma treatment. Moreover, Rac1 GTPase was required for maximal heat shock protein 10 and heat shock protein 60 inductions by interferon-gamma. These results suggest that interferon-gamma-induced upregulations of heat shock protein 60 and heat shock protein 10 in C6 astroglioma cells are mediated by the signal transducers and activators of transcription 3-binding site, localized in the bidirectional promoter.
Kim
Seung-Woo
SW
Department of Anatomy and Center for Advanced Medical Education (BK21 project), Inha University School of Medicine, Inchon, Korea.
Kim
Jung-Bin
JB
Kim
Jae-Hong
JH
Lee
Ja-Kyeong
JK
D000818:Animals; D001665:Binding Sites / Q000187:drug effects / Q000502:physiology; D045744:Cell Line, Tumor; D018835:Chaperonin 10 / Q000378:metabolism*; D018834:Chaperonin 60 / Q000235:genetics / Q000378:metabolism*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D005910:Glioma / Q000378:metabolism; D007371:Interferon-gamma / Q000494:pharmacology*; D009154:Mutation / Q000502:physiology; D011401:Promoter Regions, Genetic / Q000187:drug effects / Q000502:physiology*; D011485:Protein Binding / Q000187:drug effects / Q000502:physiology; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D011994:Recombinant Proteins; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D050796:STAT3 Transcription Factor / Q000378:metabolism*; D013997:Time Factors; D014158:Transcription, Genetic / Q000187:drug effects
D018835:Chaperonin 10; D018834:Chaperonin 60; D012333:RNA, Messenger; D011994:Recombinant Proteins; D050796:STAT3 Transcription Factor; C494088:Stat3 protein, rat; D007371:Interferon-gamma