MRI-assessed therapeutic effects of locally administered PLGA nanoparticles loaded with anti-inflammatory siRNA in a murine arthritis model

Journal of Controlled Release : Official Journal of the Controlled Release Society
Bernard C M te BoekhorstKlaas Nicolay

Abstract

Rheumatoid arthritis is characterized by systemic inflammation of synovial joints leading to erosion and cartilage destruction. Although efficacious anti-tumor necrosis factor α (TNF-α) biologic therapies exist, there is an unmet medical need for safe and more efficient treatment regimens for disease remission. We evaluated the anti-inflammatory effects of poly(dl-lactide-co-glycolide acid) (PLGA) nanoparticles loaded with small interfering RNA (siRNA) directed against TNF-α in vitro and in vivo. The siRNA-loaded PLGA nanoparticles mediated a dose-dependent TNF-α silencing in lipopolysaccharide-activated RAW 264.7 cells in vitro. The severity of collagen antibody-induced arthritis in DBA/1J mice was assessed by paw scoring and compared to the degree of magnetic resonance imaging (MRI)-quantified joint effusion and bone marrow edema. Two intra-articular treatments per joint with nanoparticles loaded with TNF-α siRNA (1 μg) resulted in a reduction in disease activity, evident by a significant decrease of the paw scores and joint effusions, as compared to treatment with PLGA nanoparticles loaded with non-specific control siRNA, whereas the degree of bone marrow edema in the tibial and femoral head remained unchanged. When the siRN...Continue Reading

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