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• W2907486382 abstract "Cyclosporine A (CsA) is an extremely hydrophobic immunosuppressive drug, whose systemic administration to suppress the activity of T cells and T cell-based immune responses is frequently associated with a number of adverse drug reactions. Local delivery of CsA focused on a specific target organ has been proposed as a possible solution to this problem. In this study, we developed biodegradable sol-gel drug delivery systems, consisting of HA-Ca-Alg hydrogels combining hyaluronic acid calcium complex (HA-Ca) and sodium alginate (Alg-Na) components, for the local sustained delivery of CsA. A HA-Ca complex with very high degree of substitution was prepared by the acid-base reaction of hyaluronic acid and calcium acetate. The gelation was completed within about 2-45 min without external addition of calcium salts such as CaSO4 and CaCl2, indicating the high potential of the present hydrogel systems for drug delivery by injection in vivo. The HA-Ca system was characterized by high-resolution inductively coupled plasma-optical emission spectroscopy, 1H NMR, FT-IR, and thermogravimetric analysis methods. Moreover, the scanning electron microscopy analysis of the HA-Ca-Alg hydrogels showed an irregular porous morphology, with interconnected pores of 50-300 μm width. The sol-gel transition and the maximum viscosity (about 10,000 cP) of the HA-Ca-Alg hydrogels were characterized by examining the time evolution of the viscosity at 37 °C. The hydrolytic degradation of the HA-Ca-Alg hydrogel was also examined at 37 °C. CsA-encapsulated HA-Ca-Alg hydrogels exhibited sustained in vitro release of CsA over 14 days, which was confirmed through in vitro measurements of the activity of murine T cells over 2 weeks. These results show that the present injectable HA-Ca-Alg hydrogels can be used effectively for the sustained delivery of extremely hydrophobic immunosuppressive drugs, including CsA." @default.
• W2907486382 created "2019-01-11" @default.
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• W2907486382 date "2019-05-01" @default.
• W2907486382 modified "2023-10-17" @default.
• W2907486382 title "Biodegradable and injectable hydrogels as an immunosuppressive drug delivery system" @default.
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• W2907486382 doi "https://doi.org/10.1016/j.msec.2018.11.051" @default.
• W2907486382 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30813049" @default.
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