Rosiglitazone and ATRA on gastric cancer SGC7901 cell line proliferation in vitro / 中国医师杂志

Objective To investigate the influence of PPARγ excitomotor RSG and ATRA on gastric cancer SGC7901 cell line proliferation in vitro and its potential mechanism study.Methods Human gastric cancer SGC7901 cell line was cultured in vitro.Experiment samples were divided to blank group,10μmol/L ATRA group, 12.5μmol/L RSG group, 25μmol/L RSG group, 10μmol/L ATRA + 25μmol/L RSG group.Proliferation inhibitory effect was determined by MTI assay.Flow cytometry was used to detect cell cycle, H.E stain was used to observed micrography alteration.Expression of PPARγ protein in gastric cancer cells were measured by immunohistochemistry.PPARγ mRNA in gastric cancer cells were measured by RT-PCR.Results ATAR at concentration 10μmol/L, RSG at 12.5 μmol/L and RSG at 25 μmol/L could inhibit the proliferation of SGC7901 cells in a dose-and time-dependent, and when both agents were combined for 72h, growth inhibition ratio was (29.73 ± 0.69) %.Flow cytometry analysis revealed a cell cycle arrest at G1 and S phase, and when both agents combined, S% was (12.87 ± 0.35 )%, cell micrography tended to be normal when both agents combined.Up-regulation of PPARγ protein and PPARγ mRNA expressions were also observed, those effects were enhanced when both agents combined, and grey scale ratio was 0.646.Conclusion The ATRA and RSG could significantly induced growth inhibition of human gastric cancer SGC7901 cell, which may be associated with cell cycle arrest and inducing differentiation, activation of PPARγ protein and PPARγ mRNA expression.Synergistic effect could be caused by the combined use of the two agents.

Preparation and in vitro antioxidative activity of acetylated fucoidan extracted from Laminaria japonica / 中国海洋药物

Objective To explore the optimum method for preparation of acetylated fucoidan extracted from Laminaria japonica,and test the antioxidative activity of acetylated fucoidans prepared under different conditions in vitro.Methods Using acetic anhydride as acetylated reagent,N-Bromosuccinimide(NBS) as catalyst,the effects of reaction time,temperature and volume of acetylated reagent were tested by the orthogonal design method.The antioxidative activity of the prepared acetylated fucoidans in vitro was determined,including scavenging activity against superoxide,hydroxyl and DPPH radical and reducing power.Results Volume of acetylated reagent and reaction temperature were the significant factors(P