Checkpoint Kinase (Chk) Inhibitor

Prexasertib (LY2606368) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a K_i of 0.9 nM and an IC₅₀ of <1 nM. Prexasertib inhibits CHK2 (IC₅₀=8 nM) and RSK1 (IC₅₀=9 nM). Prexasertib causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib shows potent anti-tumor activity.

AZD-7762 is a potent ATP-competitive checkpoint kinase (Chk) inhibitor in with an IC₅₀ of 5 nM for Chk1.

Rabusertib (LY2603618) is a potent and selective inhibitor of Chk1 with an IC₅₀ of 7 nM.

BML-277 is a selective checkpoint kinase 2 (Chk2) inhibitor with an IC₅₀ of 15 nM.

Monalizumab (IPH2201) is an immune checkpoint inhibitor targeting Natural Killer Group 2A (NKG2A). Monalizumab, a humanized anti-NKG2A blocking mAb, increases IFN-γ production, thereby promoting NK cell effector functions. Monalizumab can be used for the research of head and neck squamous cell carcinoma (HNSCC).

BEN-28010 is a selective, orally active, blood-brain barrier permeable CHK1 inhibitor with an IC₅₀ of 4.0 nM. BEN-28010 functions as a radiosensitizer, exhibits antitumor efficacy in GBM models. BEN-28010 can be used for the research of glioblastoma.

4"-Isovalerylspiramycin I (Isovalerylspiramycin I) is a topoisomerase 1 (TOP1) inhibitor and an antitumor agent. 4"-Isovalerylspiramycin I directly binds to TOP1, suppresses DNA replication, and induces DNA damage. 4"-Isovalerylspiramycin I downregulates phosphorylated CHEK1 and the ATR/CHEK1 DNA damage repair pathway, blocks DNA repair, and augments DNA damage. 4"-Isovalerylspiramycin I suppresses proliferation, migration, and invasion of osteosarcoma cells. 4"-Isovalerylspiramycin I induces apoptosis and cell cycle arrest in osteosarcoma cells. 4"-Isovalerylspiramycin I exerts antibacterial activity against methicillin-resistant Staphylococcus aureus. 4"-Isovalerylspiramycin I can be used for the research of osteosarcoma, upper respiratory bacterial infections, and methicillin-resistant Staphylococcus aureus infection.

CCT245737 (SRA737) is an orally active and seletive Chk1 inhibitor, with an IC₅₀ of 1.3 nM.

SCH900776 (MK-8776) is a potent, selective and orally bioavailable inhibitor of checkpoint kinase1 (Chk1) with an IC₅₀ of 3 nM. SCH900776 shows 50- and 500-fold selectivity over CDK2 and Chk2, respectively.

ART0380 is a potent, selective and orally active ATR kinase inhibitor. ART0380 potently inhibits human ATR-ATRIP complex with an IC₅₀ of 51.7 nM. ART0380 binds the ATP pocket of the ATR-ATRIP complex, blocks ATR-dependent Chk1 serine 345 phosphorylation, and induces cell cycle disorder and DNA damage. ART0380 demonstrates potent and selective antitumor activity in preclinical models with varying types of ataxia-telangiectasia mutated (ATM) gene aberrancy. ART0380 can be used for the research of cancer, such as colorectal cancer and prostate cancer.

CCT241533 hydrochloride is a potent and selective CHK2 inhibitor with an IC₅₀ of 3 nM and a K_i of 1.16 nM.

CHIR-124 is a potent and selective Chk1 inhibitor with IC₅₀ of 0.3 nM, and also potently targets PDGFR and FLT3 with IC₅₀s of 6.6 nM and 5.8 nM.

PF 477736 (PF 00477736) is a potent, selective and ATP-competitive inhibitor of Chk1, with a K_i of 0.49 nM, it is also a Chk2 inhibitor, with a K_i of 47 nM. PF 477736 shows <100-fold selectivity for Chk1 over VEGFR2, Fms, Yes, Aurora-A, FGFR3, Flt3, and Ret (IC₅₀=8 (K_i), 10, 14, 23, 23, 25, and 39 nM, respectively). PF 477736 can enhance Gemcitabine antitumor activity in vitro and in vivo.

Prexasertib dihydrochloride (LY2606368 dihydrochloride) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a K_i of 0.9 nM and an IC₅₀ of <1 nM. Prexasertib dihydrochloride inhibits CHK2 (IC₅₀=8 nM) and RSK1 (IC₅₀=9 nM). Prexasertib dihydrochloride causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib dihydrochloride shows potent anti-tumor activity.

PD 407824 is a checkpoint kinase Chk1 and WEE1 inhibitor with IC₅₀s of 47 and 97 nM, respectively. PD 407824 is a chemical BMP sensitizer and increases the sensitivity of cells to sub-threshold amounts of BMP4.

SB-218078 is a potent, selective, ATP-competitive and cell-permeable checkpoint kinase 1 (Chk1) inhibitor that inhibits Chk1 phosphorylation of cdc25C with an IC₅₀ of 15 nM. SB-218078 is less potently inhibits Cdc2 (IC₅₀ of 250 nM) and PKC (IC₅₀ of 1000 nM). SB-218078 causes apoptosis by DNA damage and cell cycle arrest.

Prexasertib dimesylate (LY2606368 dimesylate) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a K_i of 0.9 nM and an IC₅₀ of <1 nM. Prexasertib dimesylate inhibits CHK2 (IC₅₀=8 nM) and RSK1 (IC₅₀=9 nM). Prexasertib dimesylate causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib dimesylate shows potent anti-tumor activity.

LY2880070 is an orally active CHK1 inhibitor, IC₅₀ ＜ 1 nM. LY2880070 can be used as an anticancer agent for combination with DNA damaging agents.

GDC-0575 (ARRY-575, RG7741) is a highly-selective oral small-molecule Chk1 inhibitor with an IC₅₀ of 1.2 nM.

CCT244747 is a potent, orally bioavailable and highly selective CHK1 inhibitor, with an IC₅₀ of 7.7 nM; CCT244747 also abrogates G2 checkpoint with an IC₅₀ of 29 nM.