RESUMO
Objective:Effect of the low molecular weight natural tumor suppressor (LMW NTS) of human fetal hepatocyte and that of embryo calf hepatocyte on the growth of murine S 180 cells was observed.Methods:LMW NTS was isolated respectively from human fetal hepatocyte and embryo calf hepatocyte.(1)In vitro two layers agar plate culture method was used to detect the suppressive effect of the human fetal hepatocyte LMW NTS and the emtryo calf hepatocyte LMW NTS on the growth of murine S 180 cells.(2)Surviral of the mice bearing S 180 cells and treated respectively with intraperitoneal injections of the human fetal hepatocyte LMW NTS or the embryo calf hepatocyte LMW NTS(0.5 mg/one mouse/day for 21 days)was surveyed.Results:Both the human fetal hepatocyte LMW NTS and the embryo calf hepatocyte LMW NTS can obviously inhibit the growth of murine S 180 cell,and the suppressive effect was enhanced while the concentration of LMW NTS was increased.Survival of the mice bearing tumor that treated with intraperitoneal injections of the human fetal hepatocyte LMW NTS or the embryo calf hepatocyte LMW NTS was remarkably prolonged.Conclusion:The LMW NTS of embryo calf hepatocyte is similar to that of human fetal hepatocyte,and it possesses marked anti tumor activity both in vitro and in vivo.