Evidence that hypoxia-inducible factor-1 (HIF-1) mediates transcriptional activation of interleukin-1beta (IL-1beta) in astrocyte cultures

Journal of Neuroimmunology
Wandong ZhangD Stanimirovic

Abstract

Hypoxia-inducible factor-1 (HIF-1) is a heterodimeric transcription factor composed of HIF-1alpha and HIF-1beta subunits and involved in the regulation of gene expression in adaptive response to hypoxia. This study reports that the inflammatory cytokine interleukin-1beta (IL-1beta) shares common features of other known HIF-1alpha-regulated genes. Both human and mouse IL-1beta genes carry multiple HIF-1-binding sites in their promoter regions and are up-regulated by hypoxia and CoCl2 in human and mouse astrocytes in parallel with up-regulation of HIF-1alpha mRNA and protein. Inhibition of HIF-1alpha degradation by proteasome inhibitor, MG-132, potentiated hypoxia-induced IL-1beta release from human astrocytes, and this response was blocked in the presence of CdCl2. Mouse astrocytes with Hif1alpha+/- genotype demonstrated attenuated up-regulation of both HIF-1alpha and IL-1beta by hypoxia and CoCl2. Mutation of HIF-1-binding sites in the IL-1beta promoter abolished hypoxia-induced transactivation of the reporter gene transfected into human astrocytes. Similarly, HIF-1 binding "decoy" oligonuleotide transfected into astrocytes inhibited both hypoxia-induced transactivation of the HIF-1 reporter gene and IL-1beta secretion from tra...Continue Reading

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