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To study whether prostaglandins (PG) can regulate the mRNA expression of monocyte-chemoattractant protein 1 (MCP-1) in glomerular immune injury, MCP-1 mRNA levels were evaluated in anti-thymocyte antibody (ATS) -induced glomerular injury by Northern blotting and reverse transcription-polymerase chain reaction. Immune injury was induced in vivo by the intravenous application of ATS to male Wistar rats and in vitro by the perfusion of isolated rat kidneys with ATS and rat serum. In vivo 3 h and 5 days after antibody application, glomerular mRNA expression of MCP-1 was markedly enhanced compared with controls. In the isolated perfused kidney, antibody and complement also induced an increase in MCP-1 expression at 10 min and 60 min after antibody perfusion. When the rats were treated with PGE (250 micrograms, twice daily), the increase in MCP-1 expression was reduced. This was associated with a reduction of intraglomerular recruitment of monocytes/macrophages. In the isolated perfused kidneys, PGE1 (1 mg/L) prevented the antibody- and rat serum-stimulated increase in glomerular MCP-1 mRNA expression. These data demonstrate that PGE1 reduces glomerular MCP-1 mRNA expression in glomerulonephritis and in the isolated perfused rat kidney after induction of immune injury with antibody and complement. The data suggest that prostaglandins might mediate MCP-1 effects in glomerular immune injuries.

Prostaglandin E1 reduces the glomerular mRNA expression of monocyte-chemoattractant protein 1 in anti-thymocyte antibody-induced glomerular injury.