Abstract
In this report, we determined that induction of the DR alpha-chain by recombinant human interferon-gamma (IFN-gamma) in a human glioblastoma multiform cell line is transcriptionally regulated and showed that protein synthesis is not necessary for this to occur. The regions of the DR alpha-chain gene that are responsible for basal and recombinant IFN-gamma-induced gene transcription have been determined by gene transfer of a series of 5' deletion mutants in which the upstream region of the DR alpha chain was linked to a reporter gene, chloramphenicol acetyltransferase. Chloramphenicol acetyltransferase transcript and protein levels were determined by S1 nuclease protection and chloramphenicol acetyltransferase enzyme assays, respectively. By using these deletion mutants, we were able to draw the following conclusions. (i) One hundred and nine base pairs of upstream sequence contains the basic DR alpha-chain gene promoter and represents the minimal amount of sequence necessary for basal gene expression. (ii) An additional 9 base pairs of upstream sequence can mediate recombinant IFN-gamma induction. (iii) Maximal recombinant IFN-gamma induction requires at most an additional 23 base pairs of upstream sequence. (iv) The sequence between positions -267 and -141 does not appear to contain any additional positive or negative regulatory elements. These results suggest that the region between positions -141 and -109 contains a critical IFN-gamma-responsive element. Substitution mutagenesis was performed to confirm this suggestion.
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Selected References
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