[Effects of bile acids on expression of interleukin-6 and cell viability in QBC939 cell line].

Objective To research the effects of bile acids on the expression of interleukin-6 (IL-6)and the cell viability in QBC939 cell line. Methods Human cholangiocarcinoma cells were stimulated with 800 μmol/L bile acid (CA), 100 μmol/L deoxycholate (DCA), 100 μmol/L chenodeoxycholic acid (CDCA) ,1200 μmol/L gly acid (GCA) ,200 μmol/L glycodeoxycholic acid (GDCA) and 300 μmol/L gly chenodexycholic acid (GCDCA). MTT assay and ELISA were used to detect the cell viability and the expression of IL-6 at 24 h,48 h and 72 h. Results Treated by DCA, CDCA and GCDCA for 48 hours, the cell viability ratios changed to 0. 61,0. 58 and 1.26,which were significant differences between control group and treated groups. And after 72 hours, the viability ratios of group CA, group DCA, group CDCA, group GCA,group GDCA and group GCDCA turned into 0. 48,0. 50,0. 42,1.29,1.30 and 1.41. The differences of cell viability between bite acid-treated groups and control group were significant ( P ＜ 0. 05 ). The expression of IL-6 in control group at 48 h and 72 h was ( 198±32) ng/L and (323 ±34) ng/L,while treated by CA,DCA,CDCA,GCA,GDCA and GCDCA respectively for 48 hours,the expression of IL-6 altered to ( 106 ±33) ng/L,(88±29) ng/L,(116 ±54) ng/L,(413 ±21) ng/L,(587 ±32) ng/L and (366 ±30) ng/L.After 72 hours,the expression of IL-6 of each bile acid-treated groups as above was (123 ±66) ng/L, (45 ±21) ng/L,(74 ±45) ng/L,(792 ±13) ng/L,(1310 ±22) ng/L and (845 ±18) ng/L,respectively. The differences between each bile acid-treated group and control group were significant( P ＜0.05). Conclusions Free bile acids (CA, DCA and CDCA) can inhibit the expression of IL-6 and the cell viability, while glycineconjugates ( GCA, GDCA and GCDCA) can promote the expression of IL-6 and the cell viability. Bile acids can change tumor cell viability via IL-6 pathway. Key words: Cholic acids; Bile duct neoplasms; Cell viability; Interleukin-6