RÉSUMÉ
Objective To explore the mechanisms of different cholic acid for reducing damage to human liver cells lines L-O2 induced by amanita toxic peptides (amataxins).Methods According to different concentrations of amataxins,the experiment was conducted with different dosages in 5 groups:0.00 g/L,0.26 g/L,0.40 g/L,1.40 g/L and 2.80 g/L.The human liver cells lines L-O2 in the exponential growth phase were cultured into 96-well plates,1 ×103 cells per well After 24 hours,the concentrations of amanita toxic peptides mentioned above were added.The minimum concentration of mushroom toxins keeping the liver cells alive was determined after 24,48 and 72 hours,respectively,and MTT method was used to test each group's liver cell activity.The experiment included 3 groups:the control group,the damage group,and the cholic acid group.Each group had 3 time points:24,48 and 72 hours after being attacked.Twenty four hours after attack,in cholic acid group,cholic acid drugs including taurocholic acid gca,goose deoxycholic acid,gansu ammonia goose deoxycholic acid and bovine goose deoxycholic acid were given,respectively,to protect the injured liver cells.Cells' morphology changes were observed under the inverted phase contrast microscope,living cells were counted by using MTT method,and aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities in the culture supernatant were tested by the biochemical method.Results The minimum attack concentration of lamanita toxic peptides keeping liver cell survival in vitro was 1.40 g/L.Seventy-two hours after attack by amanita toxic peptides,the absorbance value was 0.812 ± 0.035,0.345 ± 0.021,0.363 ± 0.018,0.387 ± 0.027,0.431 ± 0.018,0.465 ± 0.015 and 0.452 ± 0.030,respectively in the control group,the damage group,the taurocholic acid group,the goose deoxycholic acid group,the glycocholic acid group,the glycochenodeoxycholic acid group and the sodium deoxycholic acid group.Compared with the damage group,absorbance value 72 hours after attack in each cholic acid group gradually increased,and compared with damage group,the differences were statistically significant among goose deoxycholic acid group,glycocholic acid group,glycochenodeoxycholic acid group and sodium deoxycholic acid group(P ＜ 0.05).AST and ALT activity in each cholic acid group declined,and that in glycochenodeoxycholic acid group was the lowest.Compared with the damage group,the difference was statistically significant (P ＜ 0.01).Conclusions Cholic acid can protect human liver cells from the damage induced by amanita toxic peptides.Such effect may be related to the fact that both amanita toxic peptides and cholic acid are the substrates of NTCP and OATP.