Sinapic Acid Loaded Secondary Growth of SiO2–Au Core Shell Nanostructure as an Effective Antiarthritic Agent to Treat Collagen-Induced Arthritis

Systemic autoimmune disease of rheumatoid arthritis (RA) is a severe case of joint deformity. Serious off-targeted drugs are not capable of curing RA and lead to increased risk of infection. Nanoparticles-based arthritis therapy is a promising approach to promote effective treatment strategy in inflammatory tissues. In particular, an inorganic-metal hybrid form of core–shell nanostructure has a significant role in the drug application due to its unique properties arising from either core or shell materials. Presently, the Au–SiO2 core–shell nanomaterials with an average diameter of 78 nm were successfully synthesized. The nanomaterials revealed a very high sinapic acid (SA) loading to eliminate the inflammatory response in RA by avoiding the side effects of conventional drugs. Various characterization techniques revealed that the as-fabricated Au–SiO2 has a higher-contrast core and aggregates of SiO2 on their surfaces/of the shell. Besides, Au–SiO2 core–shell exhibits the large extended pore structure to store a large quantity of SA drugs. Then, the mice were treated with different doses of SA loaded Au–SiO2 core–shell to assess the various biochemical parameters, including body weight, arthritic score analysis, hind paw volume, organ indices measurement, histological analysis pro-inflammatory cytokines, and anti-serum antibody analysis. The obtained results have proven that SiO2–Au develop a core–shell skin structure and each with its unique SA loading might act as a potential anti-inflammatory agent, which can be effectively used to treat collagen-induced arthritis compared to Au–SiO2 and SA. Therefore, SA loaded Au–SiO2 core–shell nanomaterials might employ as an interesting candidate in future arthritis applications.