PMID: 11607930Oct 19, 2001Paper

Cyclin-dependent kinase inhibitors for treating cancer

Medicinal Research Reviews
P L Toogood

Abstract

Cyclin dependent kinases (Cdks) are essential enzymes for the control of cell cycle progression. Inhibitors of cyclin-dependent kinases are anticipated to possess therapeutic utility against a wide variety of proliferative diseases, especially cancer. The field of published small molecule Cdk inhibitors is briefly reviewed here as background to a summary of work on a class of pyrido[2,3-d]pyrimidine Cdk inhibitors. Compounds from this class are described that display potency against cyclin D/Cdk4 up to IC(50) = 0.004 microM. Good to moderate selectivity for cyclin D/Cdk4 is also reported for compounds in this structural class. Structure-activity relationship data are presented for substitution at the C2 and N8 positions and these data are interpreted in the context of a binding model that is based on the Cdk2 crystal structure. A representative cyclin D/Cdk4 inhibitor (compound 56) is demonstrated to selectively inhibit the proliferation of an Rb(+) cell line vs. a matched Rb(-) cell line and to produce a distinct G(1) block consistent with cyclin D/Cdk4 inhibition in cells.

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