Abstract 462: Soluble CD80 restores T-cell activation and overcomes tumor cell programmed death ligand-1-mediated suppression

• Published in: Cancer research (Chicago, Ill.) Ill.), 2013-04, Vol.73 (8_Supplement), p.462-462
• Main Authors: Haile, Samuel, Dalal, Sonia P., Clements, Virginia, Tamada, Koji, Ostrand-Rosenberg, Suzanne
• Format: Article
• Language: English
• ISSN: 0008-5472; 1538-7445
• DOI: 10.1158/1538-7445.AM2013-462

Many tumor cells escape anti-tumor immunity through their expression of Programmed Death Ligand 1 (PDL1 or B7-H1), which interacts with T cell-expressed PD1 and results in T cell apoptosis. We previously reported that transfection of human tumor cells with a membrane-bound form of the costimulatory molecule CD80 prevented PD1 binding and restored T cell activation. We now report that membrane-bound CD80 similarly reduces PDL1-PD1-mediated suppression by mouse tumor cells, and that a fusion protein consisting of the extracellular domains of CD80 fused to an Fc domain of IgG1 overcomes PDL1-mediated suppression by human tumor cells. T cell activation experiments assessing costimulation indicate that the soluble CD80 fusion protein mediates its effects by binding to PDL1 and inhibiting PDL1-PD1 interactions. Comparison of the CD80 fusion protein to antibodies specific for PD1 or PDL1 demonstrate that soluble CD80 treatment is more effective in restoring T cell activation than treatment with mAb to either PD1 or PDL1. These studies identify soluble CD80 as an alternative and potentially more efficacious therapeutic agent for overcoming PDL1-induced immune suppression and facilitating tumor-specific immunity. Citation Format: Samuel Haile, Sonia P. Dalal, Virginia Clements, Koji Tamada, Suzanne Ostrand-Rosenberg. Soluble CD80 restores T-cell activation and overcomes tumor cell programmed death ligand-1-mediated suppression. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 462. doi:10.1158/1538-7445.AM2013-462