Résumé
Objective:To investigate the effect of combination of D-methionine and docetaxel on gastric cancer cells. Methods:First, seven gastric cancer cell lines were cultured with three different kinds of media (D-Met, L-Met and Met~ - ) for five days, and cell cycle was detected by flow cytometry. Second, gastric cancer cells were respectively cultured in L-Met, D-Met, and Met~ - media for 96 h, then docetaxel was added into 3 media. After 24 h, proliferation was measured by MTT method. Results:All gastric cancer cell lines were arrested in G_ 2 /M phase (P
Résumé
Objectives:To study the methionine dependence(Met dependence) of human primary gastric cancer cells in vitro when Met in the culture medium was replaced by its precursor homocysteine(Hcy),and the effect of methionine starvation in combination with chemotherapeutical agents on gastric cancer cells. Methods:Fresh and sterile gastric cancer samples were managed to single cell suspensions and then were cultured in Met -Hcy + and Met +Hcy - medium separately,the proliferation of tumor cells in different culture media was examined by microcytotoxicity(MTT) assay.Meanwhile,the inhibition rate of tumor cells by ADM、DDP、5 FU、MMC and MTX in Met -Hcy +medium was separately tested. Results:①In Met -Hcy + medium,the human primary gastric cancer cell decreased;②Methionine deprivation in combination with chemotherapy enhanced obviously the killing capacity of each chemotherapeutical agent. Conclusions:①Human primary gastric cancer cells in vitro appears Met dependent.②The combined application of Met -Hcy + medium and different chemotherapeutical agents could enhance the antitumor effect of chemotherapy on primary gastric cancer cells.③MTT assay was an efficient way to examine the sensititivity of methionine starvation therapy combined with individualized chemotherapeutical agents.
Résumé
Objectives: To study the effect of D-methionine on gastric cancer and its mechanism. Methods: We used a medium with D-methionine to culture six gastric cancer cell lines. The medium with L-methionine acted as control to culture cells. The proliferation of cells was detected by MTT. Apoptotic rates and cell cycle were detected by FMC. Results: Absorbance of all cell lines was significantly lower than control (P0.05). KATO-Ⅲ cells stayed more in G 0 /G 1 phase (P