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The Journal of Immunology, Vol 155, Issue 1 226-235, Copyright © 1995 by American Association of Immunologists
ARTICLES |
CS Osborne, MA Vadas and PN Cockerill
Hanson Centre for Cancer Research, Institute of Medical and Veterinary Science, Adelaide, Australia.
Granulocyte-macrophage (GM)-CSF and IL-3 are hemopoietic growth factors whose genes are closely linked in both humans and mice. In humans, the GM-CSF and IL-3 genes are regulated by a cyclosporin A-inhibitable enhancer located 3 kb upstream of the GM-CSF gene that is inducible by signals that mimic TCR activation. To search for a murine homologue of this enhancer we probed mouse genomic DNA and located a 400-bp element 2 kb upstream of the mouse GM-CSF gene that was 76% homologous with the human GM-CSF enhancer. Like the human GM-CSF enhancer, this element formed a cyclosporin A-inhibitable DNase I-hypersensitive site in the murine T cell line EL4 upon activation with phorbol ester and calcium ionophore. Transient transfection assays showed that this homologue of the human enhancer acted as an inducible enhancer of the thymidine kinase promoter, the mouse IL-3 promoter, and the human GM-CSF promoter. We observed, however, that the mouse GM-CSF promoter was significantly more active than the human GM-CSF promoter and found that it supported a level of activity equivalent to the combination of the human GM-CSF promoter and the human GM-CSF enhancer. Consequently, the activity of mouse GM-CSF promoter was not significantly elevated in the presence of the mouse GM-CSF enhancer. Because the mouse GM-CSF enhancer is considerably less active than its human homologue we suggest that the mouse GM-CSF gene has evolved with less dependence upon the upstream enhancer for its activation.
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