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Freshly isolated MDSCs suppress the in vitro proliferation of activated lymphocytes. Interestingly, the suppressive mechanisms appear to be strain specific. In the Th1 cell prone strain C57BL/6, it is mediated by NOS2 through NO production (34), whereas, in the mixed Th1/Th2 cell BALB/c strain, suppression requires peroxynitrite formation via ARG1 and NOS2 coexpression (8) or L-arginine depletion secondary to ARG1 overexpression (35). Reductions of both ARG1 and NOS2 expression via PDE5 inhibition should affect both suppressive pathways, resulting in less MDSC-mediated immunosuppression and, therefore, enhanced antigen-specific T cell proliferation. To test this hypothesis, tumor-derived CD11b+ MDSCs were isolated from C26GM-bearing BALB/c mice. MDSC suppressive activity was determined by admixing MDSCs with CFSE-labeled HA-specific CD8+ (clone 4) or CD4+ (6.5) T cells pulsed with their relevant peptide in the presence or absence of sildenafil (Fig. 7, A and B). Although the addition of tumor-derived MDSCs significantly impaired antigen-specific T cell proliferation as demonstrated by the low percentage of CFSElow clonotypic T cells, sildenafil almost completely restored both CD4+ and CD8+ responsiveness of these antigen-specific T cells. The absence of sildenafil-mediated enhancement in T cell function in the groups lacking CD11b+ cells underscores the targeted role of sildenafil on the MDSC population. Because in a Th1 cellprone environment MDSC suppression is only NOS2 dependent (34), we examined the role of PDE5 in MDSCs in a C57BL/6 background where NOS2/ mice are also available. CD11b+ MDSCs were isolated from either C57BL/6-NOS2+/+ or B16GM-bearing C57BL/6-NOS2/ B16GM melanoma-bearing mice. A suppression assay was performed by stimulating OVA-specific CD4+ T cells with the relevant peptide in the presence or absence of MDSCs obtained from either NOS2+/+ or NOS2/ tumor-bearing mice (Fig. 7 C). Although the addition of C57BL/6-NOS2+/+ MDSCs induced considerable T cell suppression, no suppression was observed with MDSCs from NOS2/ mice. Furthermore, although PDE5 inhibition reversed MDSC suppression in NOS2+/+ mice, sildenafil failed to augment T cell responsiveness in the NOS2/-derived MDSC suppression assay. These results confirm the role of NOS2 in MDSC-mediated T cell suppression (Fig. 7 C) and underscore the ability of PDE5 inhibition to reverse the two major suppressive pathways in MDSCs (ARG1 and NOS2). Headache viagra canada pharmacy order cialis online Testosterone replacement using skin patches, topical gel, or injections into the muscle may be prescribed if your blood testosterone level is low. buy viagra online sildenafil Address correspondence to Anthony J. Viera, LT, MC, USNR, Family Practice Department, PSC 490, Box 9097, U.S. Naval Hospital, Guam, FPO AP 96538-1600. Reprints are not available from the authors.