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- W4313374634 abstract "Abstract Interleukin-15 (IL-15) is a promising cytokine for cancer therapy. However, it has shown limited antitumor efficacy as monotherapy in clinical trials to date. Removal of immunosuppression of the tumor microenvironment is considered a promising approach to enhance IL-15-mediated immune responses. TGF-β is a key component for creating an immunosuppressive tumor microenvironment. Therefore, we constructed a novel bifunctional fusion protein complex, designated HCW9218, comprising a soluble fusion of two TGFβRII, human tissue factor, and human IL-15, and a second soluble fusion of two TGFβRII and a sushi domain of IL-15Rα. HCW9218 activates IL-15R signaling and the dimeric TGFβRII functions as “trap” for all the three TGF-β isoforms. In healthy and tumor-bearing C57/BL6 mice, subcutaneously administrated HCW9218 was well tolerated with a long serum half-life and was able to stimulate and induce proliferation of CD8+ T cells and NK cells. Splenocytes from HCW9218-treated mice showed enhanced metabolic activity and cytotoxicity against Yac-1 target cells compared to untreated mouse splenocytes. In the syngeneic B16F10 melanoma mouse model, a single-dose of HCW9218 exhibited strong antitumor activity in combination with chemotherapy and TA99 antibody. HCW9218 also significantly increased immune cell infiltration into tumors. Mutagenesis studies demonstrated that both the TGFβRII and IL-15/IL-15Rα domains are essential for antitumor efficacy of HCW9218. Collectively, our preclinical data demonstrate that HCW9218 elicits potent immune responses with a remarkable safety profile and serves as a novel immunotherapeutic against cancer alone or in combination with therapeutic antibodies." @default.
- W4313374634 created "2023-01-06" @default.
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- W4313374634 date "2020-05-01" @default.
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- W4313374634 title "A Novel Bifunctional Fusion Protein Comprising of TGF-βRII trap and IL15/IL-15Rα as an Immunotherapeutic against Cancer" @default.
- W4313374634 doi "https://doi.org/10.4049/jimmunol.204.supp.90.12" @default.
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