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- W4206644361 abstract "Oxidative stress has close relationship with the progression of osteoarthritis and thus is an important therapeutic target. The use of antioxidants alone has common disadvantages such as low bioavailability, poor stability, and rapid joint clearance or toxicity at high concentrations. To achieve both reactive oxygen species (ROS) responsive scavenging ability and drug targeted delivery ability, a novel polymer (PEG-PTK-PEG) was synthesized through a simple and direct reaction between polythioketal (PTK) and m-PEG-acrylate. In addition to excellent mechanical properties and high drug loading capacity, the degradation products of PEG-PTK-PEG responding to the ROS accumulating microenvironment also have excellent biocompatibility and extremely low toxicity. Further, the PEG-PTK-PEG nanoparticles (NPs) loaded with astaxanthin (ASTA), which is an antioxidant with high biological safety, could effectively reduce ROS expression and release ASTA slowly and accurately in the area of high ROS expression as a result of the polymer degradation. In the OA model, the [email protected] could effectively inhibit the expression of ROS, thereby downregulating the MAPK signaling pathway and inducing the conversion of macrophages from the M1 phenotype to the M2 phenotype. The synergistic effect of PEG-PTK-PEG's ROS-responsive drug delivery ability and ROS scavenging ability significantly promoted the therapeutic effect of OA, providing a new and effective strategy for the clinical treatment of OA." @default.
- W4206644361 created "2022-01-25" @default.
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- W4206644361 date "2022-03-01" @default.
- W4206644361 modified "2023-10-13" @default.
- W4206644361 title "The ROS‐responsive scavenger with intrinsic antioxidant capability and enhanced immunomodulatory effects for cartilage protection and osteoarthritis remission" @default.
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