NSC 109555  (Synonyms: DDUG; NCI C04808)

NSC 109555 is an ATP-competitive inhibitor of checkpoint kinase 2 (Chk2; IC₅₀=200 nM in a cell-free kinase assay). It is selective for Chk2 over Chk1 and 16 kinases in a panel but does inhibit Brk, c-Met, IGFR, and LCK with IC₅₀ values of 210, 6,000, 7,400, and 7,100 nM, respectively. NSC 109555 inhibits Chk2 autophosphorylation and phosphorylation of the Chk2 substrate histone H1 in vitro (IC₅₀=240 nM). It inhibits the growth of, and induces autophagy in, L1210 leukemia cells in vitro.2 NSC 109555 (1,250 nM) potentiates gemcitabine-induced cytotoxicity in MIA PaCa-2, CFPAC-1, PANC-1, and BxPC-3 pancreatic cancer cells, as well as reduces gemcitabine-induced increases in Chk2 phosphorylation and enhances gemcitabine-induced production of reactive oxygen species (ROS) in MIA PaCa-2 cells.

600.67

C₂₁H₃₂N₁₀O₇S₂

15427-93-7

C/C(C1=CC=C(C=C1)NC(NC2=CC=C(C=C2)/C(C)=N/NC(N)=N)=O)=N\NC(N)=N.O=S(C)(O)=O.O=S(C)(O)=O

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Please store the product under the recommended conditions in the Certificate of Analysis.

• [1]. Jobson, et al. Identification of a bis-guanylhydrazone [4,4'-diacetyldiphenylurea-bis(guanylhydrazone); NSC 109555] as a novel chemotype for inhibition of Chk2 kinase. Mol. Pharm. 72(4), 876-884 (2007).