Survival of Cancer Stem Cells under Hypoxia and Serum Depletion via Decrease in PP2A Activity and Activation of p38-MAPKAPK2-Hsp27
Figure 6
Enrichment of TICs decreases PP2A activity and increases Hsp27 activation in other solid tumors.
CCS and HCW colorectal cancer cells, A549 lung cancer cells, HTB186 medulloblastoma cells and SAS, oral cancer cells were continually cultured under serum depletion in the presence of EGF (10 ng/mL) and FGF2 (10 ng/mL) to enrich TICs (E+F) or in serum-containing medium (CTR) as a control. (A) Immunoblots for pluripotent markers. (B) Immunoblots for phosphorylated PP2A (pPP2A), PP2A and Hsp27. (C) Immunoblots for caspase 9 and 3. (D) Schema demonstrates the antiapoptosis pathway of colorectal TICs in response to in vitro hypoxia and serum depletion.