NCIt definition : A small molecule inhibitor of cell cycle checkpoint kinase 1 (Chk1), with potential
chemosensitization activity. Chk1 inhibitor GDC-0575 specifically binds to and inhibits
Chk1; this may result in tumor cells bypassing Chk1-dependent cell cycle arrest in
the S and G2/M phases, which permits the cells to undergo DNA repair prior to entry
into mitosis. Therefore, Chk1 inhibition may sensitize tumor cells to the DNA-damaging
effects of certain chemotherapeutic agents. Chk1 is an ATP-dependent serine-threonine
kinase that phosphorylates cdc25 phosphatases in response to DNA damage. This results
in both inhibitory tyrosine phosphorylation of cyclin-dependent kinase (CDK)-cyclin
complexes and cell cycle arrest, which facilitates DNA damage repair.;