IL1B and osteoarthritis: In osteoarthritis (OA), MTT(3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide, Thiazolyl Blue Tetrazolium Bromide) and flow cytometry as well as western blot data elucidated that IL-1β stimulation inhibited chondrocyte proliferation and promoted apoptosis.