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Am J Physiol Gastrointest Liver Physiol 284: G373-G384, 2003. First published October 2, 2002; doi:10.1152/ajpgi.00076.2002
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Vol. 284, Issue 3, G373-G384, March 2003

Cytokines induce HIF-1 DNA binding and the expression of HIF-1-dependent genes in cultured rat enterocytes

Marion Scharte1,2, Xiaonan Han2, Daniel J. Bertges3, Mitchell P. Fink2,3, and Russell L. Delude2,4

1 Klinik und Poliklinik für Anästhesiologie und Operative Intensivmedizin, Universitätsklinikum Münster, Münster, Germany; and Departments of 2 Critical Care Medicine, 3 Surgery, and 4 Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261

Cellular adaptation to hypoxia depends, in part, on the transcription factor hypoxia-inducible factor-1 (HIF-1). Normoxic cells exposed to an inflammatory milieu often manifest phenotypic changes, such as increased glycolysis, that are reminiscent of those observed in hypoxic cells. Accordingly, we investigated the effects of cytomix, a mixture containing IFN-gamma , TNF, and IL-1beta on the expression of HIF-1-dependent proteins under normoxic and hypoxic conditions. Incubation of intestine-derived epithelial cells (IEC-6) under 1% O2 increased HIF-1 DNA binding and expression of aldolase A, enolase-1, and VEGF mRNA. Incubation of normoxic cells with cytomix for 48 h also markedly increased HIF-1 DNA binding and expression of mRNAs for these proteins. Incubation of hypoxic cells with cytomix did not inhibit HIF-1 DNA binding or upregulation of HIF-1-dependent genes in response to hypoxia. Neither cytomix nor hypoxia increased steady-state levels of HIF-1alpha mRNA. Incubation of IEC-6 cells with cytomix induced nitric oxide (NO·) biosynthesis, which was blocked if the cultures contained L-NG-(1-iminoethyl)lysine hydrochloride (L-NIL). Treatment with L-NIL, however, failed to significantly alter aldolase A, enolase-1, and VEGF mRNA levels in normoxic cytomix-treated cells. Proinflammatory cytokines activate the HIF-1 pathway and increase expression of glycolytic genes in nontransformed rat intestinal epithelial cells, largely through an NO·-independent mechanism.

nitric oxide; glycolysis; epithelium; intestinal; aldolase A; enolase-1; vascular endothelial growth factor; hypoxia-inducible factor-1; deoxyribonucleic acid


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