PMID: 9540856Apr 16, 1998Paper

Suppression of NF-kappa B and AP-1 activation by glucocorticoids in experimental glomerulonephritis in rats: molecular mechanisms of anti-nephritic action

Biochimica Et Biophysica Acta
H SakuraiT Sugita

Abstract

Transcription factors nuclear factor-kappa B (NF-kappa B) and activator protein-1 (AP-1) play an important role in the induction of pro-inflammatory factors such as cytokines and cell adhesion molecules, which could be involved in the pathogenesis of glomerulonephritis. We have recently reported the pathogenic significance of NF-kappa B activation in experimental glomerulonephritis in rats. In this study, we investigated the pathogenic relevance of AP-1 activation in nephrotoxic serum (NTS)-induced glomerulonephritis. Increased AP-1 DNA-binding activity was detected in nephritic glomeruli by a gel shift assay. The kinetics of AP-1 activation was similar to that of NF-kappa B. Activation of both NF-kappa B and AP-1 preceded proteinuria, an important pathophysiological parameter for glomerulonephritis. Treatment with prednisolone, a glucocorticoid hormone, prevented activation of both NF-kappa B and AP-1 in glomeruli and subsequent mRNA expression of NF-kappa B- and AP-1-regulated genes. Prednisolone was also effective therapeutically and reduced DNA-binding activities of NF-kappa B and AP-1 which are already activated in nephritic glomeruli. These results suggest that activated NF-kappa B and AP-1 may play an important pathogeni...Continue Reading

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