Survival and malignant phenotype changes of human hepatoma SMMC-7721 cell line induced by cryopreservation at -50 °C

Inhibitory activity of polysaccharide extracts from three kinds of edible fungi on proliferation of human hepatoma SMMC-7721 cell and mouse implanted S180 tumor

AIM:To determine the activities of polysaccharide extracts from Flammulina velutipes (Curt. ex Fr.) Sing (FV), Lentinus edodes (LE)and Agaricus bispo-rus Sing (AB) on the proliferation of human hepatoma SMMC-7721 cells in vitro and on mouse implanted S-180 tumors in vivo.METHODS:The polysaccharide extracts were isolated from the fruit bodies of FV, LE and AB by the methods of hot-water extraction,Sevag's removal of proteins, ethanol precipitation, trypsin digestion and ethanol fractional precipitation. Human hepatoma SMMC-7721 cells were treated with 50mg/L polysaccharide extracts, and the mitosis index, mitochondria activity and cell proliferation were detected at different times in both control and experimental groups. The mice with S-180 implanted tumors were injected with the polysaccharide extracts at 24mg/kg body weight for 9d and the tumor weight was measured on the 15th day.RESULTS:The mitosis index of hepatoma cells in vitro could be significantly decreased by treatment with the polysaccharide extracts from the three kinds of edible fungi (P< 0.005). The cell numbers and mitochondria activity of SMMC-7721 cells treated with polysaccharide extracts were lower than those in control groups (P<0.005). The inhibition rates of polysaccharide extracts against implanted S-180 tumors in mice were 52.8%, 56.6% and 51.9% respectively compared with that in control groups.CONCLUSION:The polysaccharide extracts from the three kinds of edible fungi could inhibit not only the cultured malignant cells in vitro but also implanted S-180 tumor in vivo.