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Objective: To explore the optimal method for protein expression in rhES (recombinant human endostatin) and study the anti-tumor activities of rhES in solid tumor and established cell line.
Methods: Different IPTG concentrations, the timing of adding IPTG into the culture medium and the different time of expression were employed to explore the optimized conditions of protein expression. Activity examination: (1) animal experiment: nude mice bearing subcutaneous cancer in treated group and controlled group were observed. (2) cellular experiment: the inhibitory effect of rhES in T-24 established cell line were observed by MTT assay and cancer cell growth curve.
Results: The expression of rhES protein was 58.65%. Of all the E. coli body proteins, the protein purity after purification was 96.22%. Activity examination indicated that rhES could inhibit the growth of solid tumor and the established cell line. In animal experiment, the tumor inhibition rate was 66.8%. Cell experiment: the 50% inhibitory concentration (IC(50)) was 22 microg/ml. The cell population decreased 58.75% than the control group at Day 7 in the tumor cell growth curve.
Conclusion: A high expression and activity of rhES protein can be obtained by the optimized expression conditions. rhES can inhibit the cellular growth in both solid tumor and established cell line of bladder cancer.
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