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The beneficial dffects of human fetal liver cells on the D-galactosamine-inducedfulminant hepatic failure were observed in rats and the mechanisms of the effects investi-gated.The survival rate of the rats intraperitoneally injected with liver cell suspensionand cytosol was 47.37% and 42.11% respectively which was significantly higher than5.26% of the controls（P

<

0.05）.There was no statistical significance between the differ-ence of the survival rates due to two preparations.The administration of cytosol two hours before the intoduction of D-galactosamine re-sulted in a significant lowering of the plasma level of endotoxin and hepaticmalondialdehyde in rats and a marked increase of

3

H-thymindinc incorporation intohepatic DNA(DPM/OD

260

)as compared with the parameters of the controls.These re-sults suggest that there might be some biological active substance in human fetal liver cellswhich is responsible for thc effects to increase the survival rate.