KU-57788 (NU7441) is a highly potent and selective DNA-PK inhibitor with an IC₅₀ of 14 nM. KU-57788 is an NHEJ pathway inhibitor. KU-57788 also inhibits PI3K and mTOR with IC_50s of 5.0 and 1.7 μM, respectively.

＞98%

Store at -20℃ for one year（Powder）；Store at 2-4℃ for two weeks；Store at -20℃ for six months after dissolution.

NU7441；NU-7441

Off-white to beige solid

DMSO : 14.29 mg/mL (34.56 mM; Need ultrasonic)

DNA-PK；mTOR；PI3K；CRISPR/Cas9

NU7441 increases the persistence of γH2AX foci after ionizing radiation–induced or etoposide-induced DNA damage. NU7441 (0.5 μM or 1 μM) appreciably increases G2-M accumulation induced by ionizing radiation, etoposide, and doxorubicin in both SW620 and LoVo cells. NU7441 causes persistence of doxorubicin- and ionising radiation-induced DNA double-strand break and also slightly decreases homologous recombination activity DNA-PK-proficient M059-Fus-1 and DNA-PK-deficient M059 J human tumour cells. NU7441 inhibits UV-induced RPA p34 hyperphosphorylation in a dose-dependent manner both in cells lacking and cells expressing polymerase η. NU7441 increases levels of fludarabine-induced γH2AX foci and correspondingly decreased fludarabine-induced cell death in chronic lymphocytic leukemia cells. NU7441 also inhibits mitoxantrone-induced DNA-PKcs autophosphorylation and repair in chronic lymphocytic leukemia cells. It reduces the frequency of NHEJ while increasing the rate of HDR following Cas9-mediated DNA cleavage.

NU7441 intraperitoneally administrated at dose of 10 mg/kg maintains for at least 4 hours shows nontoxic and increases etoposide-induced tumor growth delay 2-fold in mice bearing SW620 xenografts.