Figure 10.
Inhibition of iNOS or IDO fails to negate GM-CSF-triggered suppression (panel A) and does not surpass IL-6-mediated release (panel B). In Panel A, PerC cell presentation of Mls that is further suppressed by 10 ng/ml of GM-CSF at high Mφ:T cell ratios was not recovered by blocking iNOS (1-MA), IDO (1-MT), or COX (Indo). In Panel B, addition of 50 ng/ml of IL-6 afforded the greatest recovery of the Mls response and increased the ability of 1-MA, 1-MT, and indo to recover T cell proliferation.