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- W2810273658 abstract "While highly efficacious in treating rheumatoid arthritis (RA), the approved Janus kinase (JAK) inhibitor, Tofacitinib (Tofa, CP-690 550), has dose-dependent toxicities that limit its clinical application. In this study, we have examined whether a prodrug design that targets arthritic joints would enhance Tofa’s therapeutic efficacy, which may provide an opportunity for future development of safer Tofa dosing regimens. A prodrug of Tofa (P-Tofa) was synthesized by conjugating the drug to the N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer via an acid cleavable carbamate linker. The therapeutic efficacy of a single dose of P-Tofa was compared to the dose-equivalent daily oral administration of Tofa in an adjuvant-induced arthritis (AA) rat model. Saline treated AA rats and age-matched healthy rats were used as controls. Observational analyses support the superior and sustained efficacy of a single dose P-Tofa treatment compared to the dose-equivalent daily Tofa administration in ameliorating joint inflammation. Micro-CT and histological analyses demonstrated that the P-Tofa treatment provided a structural preservation of the joints better than that of the dose-equivalent Tofa. Optical imaging, immunohistochemistry, and fluorescence-activated cell sorting analyses attribute P-Tofa’s superior therapeutic efficacy to its passive targeting to arthritic joints and inflammatory cell-mediated sequestration. In vitro cell culture studies reveal that the P-Tofa treatment produced sustained the inhibition of JAK/STAT6 signaling in IL-4-treated murine bone marrow macrophages, consistent with a gradual subcellular release of Tofa. Collectively, a HPMA-based nanoscale prodrug of P-Tofa has the potential to enhance the therapeutic efficacy and widen the therapeutic window of Tofa therapy in RA." @default.
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- W2810273658 date "2018-07-02" @default.
- W2810273658 modified "2023-10-12" @default.
- W2810273658 title "Development of a Janus Kinase Inhibitor Prodrug for the Treatment of Rheumatoid Arthritis" @default.
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- W2810273658 doi "https://doi.org/10.1021/acs.molpharmaceut.8b00433" @default.
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