Alsterpaullone

Alsterpaullone (9-Nitropaullone;NSC 705701) is a potent cyclin-dependent kinases (CDK) inhibitor, with IC50s of 35 nM, 15 nM, 200 nM and 40 nM for CDK1/cyclin B, CDK2/cyclin A, CDK2/cyclin E and CDK5/p35, respectively. Alsterpaullone also competes with ATP for binding to glycogen synthase kinase-3 alpha/beta (GSK-3alpha/GSK-3beta) with an IC50 of 4 nM, with antitumor activity and potential for the treatment of neurodegenerative and proliferative disorders[1].

Alsterpaullone is a derivative of kenpaullone , an ATP-competitive inhibitor of several cyclin-dependent kinases (CDKs) as well as glycogen synthase kinase 3β (GSK3β). With slightly improved potency over kenpaullone, alsterpaullone selectively inhibits Cdk1/cyclin B, Cdk2/cyclin A, Cdk2/cyclin E, Cdk5/p25, and GSK3α/β with IC50 values of 35, 15, 200, 40, and 4 nM, respectively. Alsterpaullone has been used to inhibit the cytosolic degradation of β-catenin to alter the canonical Wnt signaling pathway in primary axis patterning, to reduce tau phosphorylation in an effort to modify neuropathological events associated with Alzheimer’s disease, and to alter cell proliferation or protein expression in various diseases.