Abstract
In order to study the contribution of extrahepatic C6 to anti-Thy1.1 nephritis, C6 deficient PVG/c- livers were grafted in C6 sufficient PVG/c+ rats (Tx-L). Infusion of anti-Thy1.1 antibodies in Tx-L and PVG/c+ rats resulted in generation of C5b-9 complexes and subsequent glomerular injury, while infusion of anti-Thy1.1 antibodies in PVG/c- rats revealed no detectable C6 deposition. Because C6 mRNA was expressed in both liver and kidney tissue of PVG/c+ rats, we assessed whether production of C6 in the kidney alone was sufficient for glomerular injury. One kidney of a PVG/c- rat was replaced with a PVG/c+ kidney (Tx + K) followed by administration of anti-Thy1.1 antibodies. C6 deposits were detectable neither in PVG/c+ kidneys nor in PVG/c- kidneys of Tx + K rats, indicating that C6 production in PVG/c+ kidneys alone is not sufficient to contribute to renal injury. That C6 production had occurred was suggested by the presence of equal amounts C6 mRNA in control PVG/c+ kidneys and in grafted PVG/c+ kidneys of Tx + K rats. C6 mRNA expression in kidney tissue of PVG/c+ rats is presumably derived from peritubular sites. In conclusion, we have demonstrated that extrahepatic, but not renal synthesis of, C6 is sufficient to contribute...Continue Reading
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