MK2-IN-1 was profiled for kinase selectivity by screening against a broad panel of 150 protein kinases at a concentration of 10 μM, and only CK1γ3 was significantly inhibited at greater than 50%. MK2-IN-1 inhibited pro-inflammatory cytokine secretion from the human THP1 acute monocytic leukemia cell line, causing dose-dependent inhibition of LPS-stimulated TNFα and IL6 secretion. MK2-IN-1 also dose dependently inhibited IL1β-stimulated matrixmetalloprotease (MMP)13 secretion from the SW1353 chondrosarcoma cell line and human primary chondrocyte cultures. Of note, given its high degree of selectivity, our data suggest that MK2-IN-1 may be an excellent pharmacologic tool for specifically exploring and validating MK2 biology [3].