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- W4313383790 abstract "Abstract Myeloid derived suppressor cells (MDSCs) can inhibit T cell activation by altering the characteristics and activation of dendritic cells (DCs). We had previously reported that Ibrutinib enhances the expression of co-stimulatory molecules on DCs and promotes DC-mediated T cell activation. In the present study we further determined the mechanisms of DC immunomodulation by Ibrutinib. We evaluated the effect of Ibrutinib on (i) DC maturation and migration from the injection site to draining lymph nodes, (ii) T cell proliferation in vivo, and (iii) monocyte maturation to DCs using a mouse inflammation model. DCs were generated from mouse bone marrow-derived cells in the presence of vehicle or 10μM lbrutinib. CFES-labelled DCs were injected subcutaneously into the footpads of naive mice, and their migration to the regional lymph nodes and maturation profile was analyzed by flow cytometry. To evaluate T cell priming, CFSE-labelled OVA-specific T cells isolated from OT-II mice were injected into the tail vein of syngeneic mice that were prior injected with mature DCs loaded with OVA peptide. After four days, T cell proliferation was evaluated by CFSE dilution. In the inflammation model, C57BL6 mice were treated with vehicle or 6mg/kg/day Ibrutinib orally for a week. A sub-lethal dose of LPS was injected in the dorsal skin and the frequency of inflammatory monocytes and mature DCs was determined. We found that Ibrutinib significantly improves DC maturation and migration, inducing T cell activation and proliferation in vivo. In addition, Ibrutinib enhances monocyte maturation to DCs in the skin. The results suggest a novel effect of Ibrutinib, which may have therapeutic use for cancers characterized by a high MDSC infiltration." @default.
- W4313383790 created "2023-01-06" @default.
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- W4313383790 date "2018-05-01" @default.
- W4313383790 modified "2023-09-27" @default.
- W4313383790 title "<i>Ibrutinib has a novel immunomodulatory effect by enhancing DC maturation both in vivo and in</i> a model of inflammation" @default.
- W4313383790 doi "https://doi.org/10.4049/jimmunol.200.supp.56.3" @default.
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