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Pomalidomide inhibits PD-L1 to promote anti-tumor immunity.
Cancer Research 2018 October 13
Thalidomide-like drugs have been approved for the treatment of human multiple myeloma (MM), with their direct antitumor effects and immunomodulatory functions well documented. However, the exact molecular mechanisms that govern these effects remain unclear. Here we demonstrate that pomalidomide (POM) promotes immune response by inhibiting expression of PD-L1. POM inhibited PD-L1 expression on tumor cells to promote cytotoxic T lymphocyte (CTL) activity in vitro and suppressed PD-L1 upregulation on antigen-presenting cells (APC) to prevent peptide-induced T cell tolerance. Knockout of PD-L1 on tumor cells or in mice completely eliminated the immunomodulatory effect of POM. Furthermore, POM synergized with other immunotherapies to improve anticancer therapy. Taken together, this study identifies a new mechanism for the immunomodulatory functions of POM in cancer therapy. These results also offer a clinical approach for blocking PD-L1 induction and potentially promoting anti-tumor immunity.
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