DYRKs-IN-1 has antitumor activity. DYRKs-IN-1 is a potent DYRKs (Dual-specificity tyrosine-phosphorylation-regulated kinases) inhibitor with IC50s of 9 nM and 5 nM for DYRK1B and DYRK1A, respectively.
Dyrk1A-IN-5 (compound 5j) is a highly potent and selective inhibitor of DYRK1A, exhibiting an IC50 of 6 nM. It dose-dependently diminishes the phosphorylation of Thr434 in SF3B1, with an IC50 of 0.5 μM. Moreover, Dyrk1A-IN-5 effectively inhibits the phosphorylation of tau at Thr212, with an IC50 of 2.1 μM. Given these properties, Dyrk1A-IN-5 is a valuable tool for Down syndrome research [1].