[The killing effect of rmhTNF-alpha combined with gemcitabine on human lung adenocarcinoma cells A549.].

Background At present clinical researches has proven that the chemotherapeutic effect on advanced non-small cell lung cancer (NSCLC) has gotten to plateau. Biotherapy combined with chemotherapy could improve curative effect on advanced NSCLC obviously. The project is aiming at exploring the killing effect and the mechanism of rmhTNF-alpha in combination with gemcitabine on human lung adenocarcinoma cell line A549. Methods CCK-8 was used to detect the inhibition ratio of rmhTNF-alpha and gemcitabine cell line A549; cell curve of growth was used to illustrate the influence of rmhTNF-alpha and gemcitabine on the proliferation of A549; FCM was used to detect the cell cycle and the apoptosis ratio of cell line A549 treated with either rmhTNF-alpha or gemcitabine or those combined. The change in cellular morphology and cell ultramicromorphology was observed by light microscope and transmission electron microscope respectively. Results The result of CCK-8 and cell curve of growth demonstrated that rmhTNF-alpha not only inhibited the proliferation of A549, but also enhanced the killing effect of gemcitabine; FCM showed that rmhTNF-alpha promoted S cell cycle arrest and reduced proportion of G2/M cell arrest; also showed different apoptosis ratio was most significant in the group of rmhTNF-alpha combination with gemcitabine; the changes of morphology was observed obviously by light microscope and transmission electron microscope. Conclusions rmhTNF-alpha enhances the the killing effect of gemcitabine on human lung adenocarcinoma cells A549 by inducing apoptosis and promoting cell cycle arrest.