Dual-Stimuli Responsive Polymeric Micelles for the Effective Treatment of Rheumatoid Arthritis.

The nontargeted distribution and uncontrolled release of drugs impede their efficacy in the treatment of rheumatoid arthritis (RA). Delivering drugs to arthritic joints and releasing drugs on demand are a feasible solution to achieve the effective treatment of RA. In this paper, we report a facile method to assemble dual-stimuli responsive polymeric micelles from polyethylene glycol-phenylboric acid-triglycerol monostearate (PEG-PBA-TGMS, PPT) conjugates with the aim of delivering dexamethasone (Dex) to arthritic joints and controlling the release of Dex by inflammatory stimuli. We show that the release of Dex from the PPT micelles is accelerated in response to acidic pH and overexpressed matrix metalloproteinases. In an adjuvant-induced arthritis model, the PPT micelles preferentially accumulate in arthritic joints and show an excellent therapeutic efficacy after being intravenously administrated. Our results highlight the potential of the dual stimuli-responsive micelles as a promising therapeutic option for the effective treatment of inflammatory diseases.