Figure 4.
InS3-54 inhibits cancer cell proliferation. (A) Level of STAT3 expression and activation in different cells. Actin was used as a loading control. (B, C) Cytotoxicity assay. IC50 of inS3-54 for each cell line was derived, and dose–response curves were created using PrismPad program. (D) Apoptosis assay of exponentially growing A549 and MDA-MB-231 cells. (**p < 0.01; *p < 0.05)