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. 1993 Sep;93(3):411–417. doi: 10.1111/j.1365-2249.1993.tb08193.x

C3 and C4 gene expression and interferon-gamma-mediated regulation in human glomerular mesangial cells.

S Sacks 1, W Zhou 1, R D Campbell 1, J Martin 1
PMCID: PMC1554924  PMID: 8370168

Abstract

The glomerular mesangial cell (GMC) plays a key role in the maintenance of glomerular structure and function and in the mediation of glomerular injury. To explore the potential of this cell to produce complement and react to local inflammatory signals, we studied the synthesis and regulation of the third and fourth components of complement in cultured human GMC. Using metabolic labelling and immunoprecipitation, we found that C3 and C4 polypeptide chains were synthesized and secreted by GMC. Interferon-gamma (IFN-gamma) led to an increase in C4 protein synthesis, but not C3 synthesis. There was a corresponding increase in C4 mRNA in IFN-gamma-activated cells, but no increase in C3 mRNA, as determined by semi-quantitative polymerase chain reaction (PCR) estimation. These results demonstrate that human GMC can synthesize C3 and C4 proteins, and that regulation of expression of the C4 gene is mediated by IFN-gamma. We hypothesize that GMC production of complement could influence the clearance of immune aggregates by the kidney and the mediation of glomerular injury.

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