Researchers at Northwestern University and COUR Pharmaceutical Development Company Inc. have shown that biodegradable carboxylated poly(D,L-lactic-co-glycolic acid) (PLGA) nanoparticles containing encapsulated Ag (tolerance-inducing microparticles [TIMPs] or COUR nanoparticles [CNPs]) are able to prevent and treat type 1 diabetes (T1D) induced by transfer of monospecific diabetogenic CD4 and CD8 transgenic T cells to NOD.scid mice.