Uses
AZD 5438 is a potent oral inhibitor of cyclin-dependent kinases 1, 2, and 9, which leads to leads to pharmacodynamic changes and potent antitumor effects in human tumor xenografts.
Definition
ChEBI: 4-(2-methyl-3-propan-2-yl-4-imidazolyl)-N-(4-methylsulfonylphenyl)-2-pyrimidinamine is a sulfonamide.
Biological Activity
azd5438 is a potent small molecule inhibitor of cyclin-dependent kinase (cdk) 1, 2 and 9 with half maximal inhibitory concentration ic50 of 16 nmol/l, 6 nmol/l and 20 nmol/l respectively. azd5438 has also been found to potently inhibit the human cyclin e/cdk2 complex, the cyclin b1/cdk1 complex and the cyclin a/cdk2 complex with ic50 of 0.006 μm, 0.016 μm and 0.045 μm respectively. in previous studies, azd5438 has exhibited significant anti-proliferative activity in a few human tumor cell lines with ic50 ranging from 0.2 μmol/l to 1.7 μmol/l, in which the phosphorylation of a few proteins, including cdk substrates prb, nucleolin, protein phosphatase 1a and rna polymerase ii cooh-terminal domain, and cell cycling at g2-m, s and g1 phases were inhibited.
in vivo
AZD5438 (50 mg/kg twice daily or 75 mg/kg, p.o.) inhibits human tumor xenograft growth. In vivo, AZD5438 reduces the proportion of actively cycling cells. Further pharmacodynamic analysis of AZD5438-treated SW620 xenografts shows that efficacious doses of AZD5438 (>40% tumor growth inhibition) maintains suppression of biomarkers, such as phospho-pRbSer249/Thr252, for up to 16 hours following a single oral dose[1].
IC 50
cdk2-cyclin E: 6 nM (IC
50); cdk2-cyclin A: 45 nM (IC
50); cdk5-p25: 14 nM (IC
50); cdk1-cyclin B1: 16 nM (IC
50); cdk9-cyclin T: 20 nM (IC
50); cdk6-cyclin D3: 21 nM (IC
50); cdk4-cyclin D1: 449 nM (IC
50); cdk7-cyclin H: 821 nM (IC
50)
References
[1]camidge dr1, smethurst d, growcott j, barrass nc, foster jr, febbraro s, swaisland h, hughes a. a first-in-man phase i tolerability and pharmacokinetic study of the cyclin-dependent kinase-inhibitor azd5438 in healthy male volunteers. cancer chemother pharmacol. 2007 aug;60(3):391-8. epub 2006 nov 18.
[2]byth kf, thomas a, hughes g, forder c, mcgregor a, geh c, oakes s, green c, walker m, newcombe n, green s, growcott j, barker a, wilkinson rw. azd5438, a potent oral inhibitor of cyclin-dependent kinases 1, 2, and 9, leads to pharmacodynamic changes and potent antitumor effects in human tumor xenografts. mol cancer ther. 2009 jul;8(7):1856-66. doi: 10.1158/1535-7163.mct-08-0836. epub 2009 jun 9.
