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Lerociclib

CAS No. : 1628256-23-4

MCE 站：Lerociclib

产品活性：Lerociclib (G1T38) 是一种有效的、CDK4/6 的选择性抑制剂，其对 CDK4/CyclinD1 和 CDK6/CyclinD3 的 IC₅₀ 值分别为 1 nM 和 2 nM。

研究领域：Cell Cycle/DNA Damage

作用靶点：CDK

In Vitro: Within the CDK family, Lerociclib is least selective against CDK9/cyclin T, ~30 fold between CDK4/cyclin D1 and CDK9/ cyclin T at the biochemical IC₅₀. Lerociclib produces a robust and sustained G1 arrest in CDK4/6 dependent cells with an EC₅₀ of ~20 nM. A dose dependent increase of cells in the G1 phase of the cell cycle is observed when CDK4/6 dependent WM2664 cells are treated with Lerociclib for 24 hours. This arrest is maintained through 300 nM, more than 300x the biochemical IC₅₀. WM2664 cells treated with 30-1000 nM of Lerociclib for 24 hours exhibits a complete inhibition of RB phosphorylation compared to vehicle controls. Treatment with Lerociclib reduces RB phosphorylation within 1 hour post-treatment and generates near complete inhibition of RB phosphorylation by 16 hours post-treatment. Lerociclib produces a robust inhibition of proliferation in a diverse array of tumor cell lines including breast, melanoma, leukemia and lymphoma with EC₅₀ concentrations as low as 23 nM.

In Vivo: In this HER²⁺ breast cancer model, Mice treated with Lerociclib elicits 8% tumor regression after 21 days of treatment while control animals have a 577% increase in tumor burden over the same treatment period. Compared to the vehicle-treated mice, daily treatment with 100 mg/kg of Lerocyclib or palbociclib shows tumor regression within 10 days in the MCF7 xenograft model. After 27 days of treatment, tumor growth inhibition is observed in the 10, 50, and 100 mg/kg Lerociclib cohorts (approximately 12%, 74%, and 90% inhibition, respectively). Daily oral palbociclib treatment causes an 18%, 66%, and 87% tumor growth inhibition in the 10, 50, and 100 mg/kg dosage cohorts, respectively. Interestingly, at 50 mg/kg, Lerociclib is significantly more efficaciou than palbociclib. Similar results are seen in the ER⁺ZR-75-1 breast cancer xenograft model when comparing Lerocyclib and palbociclib at the 50 mg/kg dose. Lerociclib treated mice exhibits 77% TGI with an overall 60% tumor growth delay demonstrating Lerocyclib alone is highly efficacious in this NSCLC tumor model.

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