Possible role of the transcription factor interferon regulatory factor 1 (IRF-1) in the regulation of ornithine decarboxylase (ODC) gene expression during IFN gamma macrophage activation.
In this report we discuss the role of interferon regulatory factor 1 (IRF-1) in the regulation of ornithine decarboxylase (ODC) transcription during IFN gamma human macrophage activation. We show that a binding sequence for the transcription factor IRF-1 is contained in the first intron of the human ODC gene (from nt +2711 to nt +2722) and we demonstrate that the level of expression of IRF-1 increases in human macrophages and in the human promonocytic cell line, U937, previously differentiated in monocytes/macrophages by phorbol myristate acetate (PMA), after 2 h of IFN gamma stimulation. We also show that the hamster tk-ts13 cell line, stably transfected with the IRF-1 cDNA, over-expresses ODC. In addition, a specific complex was detected, by gel-shift assay after incubating a 20 bp double-stranded oligomer containing the binding sequence for IRF-1 with nuclear proteins extracted from human macrophages and from (PMA-differentiated) U937 cells stimulated with IFN gamma for 2 h.
Institute of General Pathology, University of Catania, Italy.
L
L
Manzella
M A
MA
Giuffrida
M R
MR
Pilastro
G
G
Girlando
G
G
Picardi
L
L
Malaguarnera
A
A
Messina
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D006224:Cricetinae; D004247:DNA; D004268:DNA-Binding Proteins / Q000502:physiology*; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology*; D006801:Humans; D050856:Interferon Regulatory Factor-1; D007371:Interferon-gamma / Q000502:physiology*; D008262:Macrophage Activation / Q000502:physiology*; D008969:Molecular Sequence Data; D009955:Ornithine Decarboxylase / Q000235:genetics*; D010750:Phosphoproteins / Q000502:physiology*; D014157:Transcription Factors / Q000502:physiology*
D004268:DNA-Binding Proteins; C494257:IRF1 protein, human; D050856:Interferon Regulatory Factor-1; D010750:Phosphoproteins; D014157:Transcription Factors; D007371:Interferon-gamma; D004247:DNA; D009955:Ornithine Decarboxylase