MAPKAP1 and prostate cancer: Furthermore, similar results were also observed in other cell lines, including human cervical cancer (HeLa), prostate cancer (PC-3), rhabdomyosarcoma (Rh30) cells and mouse embryonic fibroblasts (MEF) (Figure 1A and 1B), demonstrating that rapamycin inhibition of mSin1 phosphorylation is not cell line-dependent.