D. Bone marrow cells were treated with GM-CSF/IL-6 for 6 days to induce MDSCs and thereafter, with PGE2 ± varying concentrations of TP-16 for 12 hr. The mRNA levels of selected MDSC markers (Arg-1, Ptgs2, Il-4, and Il-10) were measured by qPCR. Data are normalized to β-actin expression levels (n=3). 