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

B.C. te Boekhorst, L.B. Jensen, S. Colombo, A.K. Varkouhi, R.M. Schiffelers, Twan Gerardus Gertudis Maria Lammers, Gerrit Storm, H.M. Nielsen, G.J. Strijkers, C. Foged, K. Nicolay

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50 Citations (Scopus)


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 siRNA dose was 5 or 10 μg, there was no difference between the specific and the non-specific siRNA treatment groups. These findings suggest that MRI is a promising method for evaluation of early disease progression and treatment in murine arthritis models. In addition, proper siRNA dosing seems to be important for a positive therapeutic outcome in vivo. However, further studies are needed to fully clarify the mechanism(s) underlying the observed anti-inflammatory effects of the siRNA-loaded nanoparticles.
Original languageEnglish
Pages (from-to)772-780
JournalJournal of controlled release
Issue number3
Publication statusPublished - 2012


  • IR-83087
  • METIS-292684


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