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We recently correlated IL-4R expression on CD11b+/Gr-1+ with an immunosuppressive phenotype (29), and our in vitro data (Fig. 5) indicate that sildenafil down-regulates IL-4R on MDSCs. We then asked whether in vivo PDE5 inhibition reduced ARG1 and NOS2 and down-regulated IL-4R in tumor-associated MDSCs. BALB/c mice were challenged with CT26WT, and half were treated with sildenafil. Mice were killed 15 d later, and intratumoral MDSCs were obtained. Sildenafil increased cGMP (Fig. 6 A), reduced IL-4R expression (Fig. 6 B), and down-regulated NOS2 and ARG1 expression and reduced their enzymatic activity in the intratumoral MDSCs (Fig. 6, C and D). Considering that ARG1 and NOS2 are key enzymes in MDSC suppressive pathways (8, 31), these findings support the hypothesis that PDE5 inhibition is a novel pharmacologic approach to regulate MDSC-mediated immunosuppressive pathways. Footnotes ?1 Abbreviations: PDE, phosphodiesterase; cAMP, adenosine 3?5?-cyclic monophosphate; cGMP, guanosine 3?5?-cyclic monophosphate; GAF, cyclic GMP, adenylyl cyclase, FhlA; CaM, calmodulin; PK, protein kinase; PKA, cAMP-dependent protein kinase; PKG, cGMP-dependent protein kinase; CNS, central nervous system; ANP, atrial natriuretic peptide; NO, nitric oxide; PDP, 9-(6-phenyl-2-oxohex-3-yl)-2-(3,4-dimethoxybenzyl)-purin-6-one; BAY 60-7750, 2-(3,4-dimethoxybenzyl)-7-[(1R)-1-hydroxyethyl]-4-phenylbutyl]-5-methylimidazo[5,1-f] [1,2,4]triazin-4(3H)-one; PI3K, phosphatidylinositol 3-kinase; IGF1, insulin-like growth factor 1; OPC-33450, 6-[3-[3-cyclooctyl-3-[(1R*,2R*)-2-hydroxycyclohexyl]ureido]-propoxy]-2(1H)-quinolinone; UCR, upstream conserved region; CRE, cAMP-responsive element-binding protein; RACK, receptor for activated C-kinase 1; AKAP, A-kinase anchoring proteins; ERK, extracellular signal-regulated kinase; BRL 50481, 3-(N,N-dimethylsulfonamido)-4-methyl-nitrobenzene; PAS, Period, Arnt, and Sim; IBMX, 3-isobutyl-1-methylxanthine; BAY 73-6691, 1-(2-chlorophenyl)-6-[(2R)-3,3,3-trifluoro-2-methylpropyl]-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidine-4-one.