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cialis To extend this finding to other models, the experiment was repeated using the 4T1 mammary carcinoma genetically modified to express the influenza-derived HA as a model tumor antigen (Fig. 3 B). Mice were challenged on day 0 with 0.5 x 106 4T1-HA cells. On the next day they received 3 x 106 HA-specific naive CD8+ T cells. After adoptive transfer, the mice were either treated with sildenafil or left untreated. As with the C26GM experiments, no therapeutic benefit was observed with ACT alone, whereas sildenafil + ACT imparted the greatest antitumor benefit. Sildenafil treatment alone, instead, substantially delayed tumor progression in immunocompetent BALB/c mice but not in immune-deficient Rag-2–/– mice (Fig. S3, available at http://www.jem.org/cgi/content/full/jem.20061104/DC1). These data confirm the immunomodulatory properties of PDE5 inhibitors in augmenting the therapeutic efficacy of ACT and demonstrate a role of sildenafil in modifying the tumor microenvironment rendering it more susceptible to CTL-mediated cytotoxicity. How well does birth control work? Contraindications online viagra 25mg
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