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Schieferdecker, H.L. et al.

Schieferdecker, Rothermel, Timmermann, Götze, Jungermann,

Anaphylatoxin C5a receptor mRNA is strongly expressed in Kupffer and stellate cells and weakly in sinusoidal endothelial cells but not in hepatocytes of normal rat liver.

Anaphylatoxins (C5a and C3a), which are generated during complement activation, have recently been shown to increase glucose output from hepatocytes (HC) in perfused rat liver. They did not act directly on HC but indirectly by prostanoid release from non-parenchymal cells (NPC), probably Kupffer cells (KC). In order to corroborate this mechanism, the distribution of anaphylatoxin receptors in the different cell types of rat liver was determined by quantitative RT-PCR with primers specific for the rat C5a receptor (rC5aR) using RNA isolated from KC, sinusoidal endothelial cells (SEC), hepatic stellate cells (HSC) and HC. In line with functional data, C5aR mRNA was detected in freshly isolated NPC but not in HC of rat liver. Mainly KC but also HSC clearly expressed C5aR mRNA, while SEC did so only weakly. KC expressed up to 10-fold more C5aR mRNA than HSC and these in turn up to 10-fold more than SEC. These results support the proposed indirect action of anaphylatoxins on HC.[1]

References

Anaphylatoxin C5a receptor mRNA is strongly expressed in Kupffer and stellate cells and weakly in sinusoidal endothelial cells but not in hepatocytes of normal rat liver. Schieferdecker, H.L., Rothermel, E., Timmermann, A., Götze, O., Jungermann, K. FEBS Lett. (1997) [Pubmed]

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