Fig 3.

Subcutaneous injection into nude mice revealed that (A) MDA-MB-231 SH-4-54-resistant clone #2 proliferated at a slower rate than its wild-type (WT) counterpart in vivo. (B) qPCR demonstrated that xCT mRNA levels were lower in tumours isolated from animals injected with clone #2 relative to WT cells (2 animals per treatment group). (C) Western blot analysis of protein isolated from subcutaneous tumours derived from in vivo growth of the clones relative to WT-derived tumours revealed that xCT levels remained low, phospho-STAT5 (p-STAT5) levels remained high, and phospho-STAT3 (p-STAT3) levels remained unchanged in the absence of SH-4-54.