New series of pyrrolidine mercaptosulfide, 2-mercaptocyclopentane arylsulfonamide, and 3- mercapto-4-arylsulfonamidopyrrolidine matrix metalloproteinase inhibitors (MMPIs) were designed, synthesized, and evaluated. Exhibiting unique properties over other MMPIs (eg, hydroxamates), these newly reported compounds are capable of modulating activities of several MMPs in the low nanomolar range, including MMP-2 (∼ 2 to 50 nM), MMP-13 (∼ ...