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USP1-IN-9 (Compound 1m) is a reversible and non-competitive inhibitor of ubiquitin-specific protease (USP1) with an IC50 value of 8.8 nM. It is synthesized based on the structures of ML323 and KSQ-4279 as a pyrido[2,3-d]pyrimidin-7(8H)-one derivative. USP1-IN-9 exhibits excellent inhibition of USP1/UAF and demonstrates strong antiproliferative effects on breast cancer cells. When combined with the PARP inhibitor olaparib, USP1-IN-9 enhances the cytotoxic effect on MDA-MB-436/OP cells. USP1-IN-9 holds potential for research in the field of cancer.

| Description | USP1-IN-9 (Compound 1m) is a reversible and non-competitive inhibitor of ubiquitin-specific protease (USP1) with an IC50 value of 8.8 nM. It is synthesized based on the structures of ML323 and KSQ-4279 as a pyrido[2,3-d]pyrimidin-7(8H)-one derivative. USP1-IN-9 exhibits excellent inhibition of USP1/UAF and demonstrates strong antiproliferative effects on breast cancer cells. When combined with the PARP inhibitor olaparib, USP1-IN-9 enhances the cytotoxic effect on MDA-MB-436/OP cells. USP1-IN-9 holds potential for research in the field of cancer.  | 
| Targets&IC50 |  USP1:8.8 nM  | 
| In vitro | USP1-IN-9, at concentrations of 20, 100, and 500 nM for 24 hours, elevates the level of monoubiquitinated proliferating cell nuclear antigen (Ub-PCNA) in non-small cell lung cancer cells (NSCLC) in a dose-dependent manner, and this increase in Ub-PCNA is evident even at a low concentration of 20 nM.  | 
| In vivo | Administered at 10 mg/kg via intragastric route, USP1-IN-9 is rapidly absorbed in male ICR mice and exhibits good metabolic stability. Pharmacokinetic parameters of USP1-IN-9 in mice show a dose of 10 mg/kg orally, with a T_max of 0.25 hours, C_max of 4780 ± 2090 ng/mL, AUC_0-t of 35,800 ± 13,500 ng·h/mL, and a T_1/2 of 7.61 ± 4.67 hours.  | 
| Storage | Powder: -20°C for 3 years | In solvent: -80°C for 1 year | Shipping with blue ice/Shipping at ambient temperature. | 

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