The rLZ-8 protein and rLZ-8 inhibits proliferation of human A549
lung cancer cells
The purity of rLZ-8 protein was .98% as determined by sodium
dodecyl sulfate–polyacrylamide gel electrophoresis and visualized by
Coomassie Blue staining (see Supplementary Figure S1A available at
Carcinogenesis Online) and western blotting (see Supplementary Figure
S1B available at Carcinogenesis Online). To test whether rLZ-8
treatment might affect cancer cell growth, A549 human lung cancer
cells were treated with various concentration of rLZ-8 for various times
and cell growth analyzed. As shown in Figure 1, rLZ-8 inhibited cell
growth significantly at the higher doses (10 and 15 lg/ml) after 48 and
72 h of incubation time. At a lower concentration of rLZ-8 (5 lg/ml),
growth inhibition was not apparent until after 72 h of incubation. Similar
results were observed when cell growth inhibition was measured by
the trypan blue exclusion assay (data not shown).
rLZ-8 enhances G1 arrest, expression of p53