Tumor necrosis factor activates angiotensinogen gene expression by the Rel A transactivator

Hypertension
Allan R BrasierK A Wimbish

Abstract

Angiotensinogen encodes the only known precursor of angiotensin II, a critical regulator of the cardiovascular system. Transcriptional control of angiotensinogen in hepatocytes is an important regulator of circulating angiotensinogen concentrations. Angiotensinogen transcription is increased by the inflammatory cytokine tumor necrosis factor (TNF)-alpha by a nuclear factor-kappaB-like protein binding to an inducible enhancer called the acute-phase response element. By gel mobility shift assays, we observe two specific acute-phase response element-binding complexes, C1 and C2. The abundance of C2 is not changed by TNF treatment. In contrast, C1 is faintly detected in untreated cells, and its abundance increases by fivefold after stimulation. We identify the nuclear factor-kappaB subunits in these complexes using subunit-specific antibodies in the gel mobility "supershift" assay. The transcriptionally inert nuclear factor-kappaB DNA-binding subunit NF-kappaB1 is present in both control and stimulated hepatocyte nuclei. Its abundance changes weakly upon TNF stimulation. In contrast, the potent transactivating protein Rel A is not found in unstimulated hepatocyte nuclei and is recruited by TNF-alpha into the C1 DNA-binding complex....Continue Reading

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