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Gene, stimulus and cell-type specific regulation of activator protein-1 in mesangial cells by lipopolysaccharide and cytokines

Granger, Rachel L., Hughes, Timothy Richard and Ramji, Dipak Purshottam 2000. Gene, stimulus and cell-type specific regulation of activator protein-1 in mesangial cells by lipopolysaccharide and cytokines. Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression 1492 (1) , pp. 100-107. 10.1016/S0167-4781(00)00089-0

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Abstract

Activator protein-1 (AP-1) plays an important role in the regulation of gene expression in mesangial cells (MC) during the pathogenesis of glomerular inflammatory disease. The precise regulation of the AP-1 family by agents that are known to activate MC is, however, poorly understood. The action of platelet-derived growth factor (PDGF) and, for the first time, lipopolysaccharide (LPS), interleukin-6 (IL-6), interferon-γ (IFN-γ) and tumour necrosis factor-α (TNF-α) on AP-1 gene expression in MC was therefore studied. Whilst the expression of JunD was not affected by any of the mediators, the mRNA levels of c-fos and JunB were induced by LPS, IL-6, IFN-γ, PDGF and TNF-α, and that of c-jun by LPS, IFN-γ, PDGF and TNF-α. Electrophoretic mobility shift assays showed a time-dependent increase in AP-1 DNA binding activity with JunB representing the major mediator-inducible member involved in DNA–protein interactions. However, stimulus-specific changes in the kinetics and magnitude of AP-1 mRNA expression and DNA binding activity were identified and, additionally, the results showed the potential existence of cell-type-specific mechanisms in the regulation of the AP-1 family. These studies provide novel insights into the mediator-specific modulation of AP-1-regulated gene expression and the activation of MC in renal diseases.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 0167-4781
Last Modified: 04 Jun 2017 06:40
URI: http://orca.cf.ac.uk/id/eprint/63451

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