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Overview
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Background
IC50: 16 μMIC261 is a novel inhibitor of CK1. The p53-targeted kinases casein kinase 1delta (CK1delta) and casein kinase 1epsilon (CK1epsilon) have been reported to be involved in regulating DNA repair and chromosomal segregation.In vitro: Previoius study found that IC261 could trigger the mitotic checkpoint control. At low micromolar concentrations, IC261 inhibited cytokinesis leading to a transient mitotic arrest. Cells with active p53 arrested in the postmitotic G1 phase by blockage of entry into the S phase. Cells containing non-functional p53 had postmitotic replication developing an 8N DNA content. The increase of DNA content was accompanied by a high amount of micronucleated and apoptotic cells. Immunfluorescence images also showed that IC261 could result in centrosome amplification causing multipolar mitosis at low concentrations [1]. In vivo: Animal study indicated that intrathecal injection of IC261 (0.1-1 nmol) could dose-dependently decrease mechanical allodynia and thermal hyperalgesia that were induced by carrageenan or CFA. In addition, bath-application of IC261 (1 μM) showed only marginal effects on spontaneous excitatory postsynaptic currents recorded in the substantia gelatinosa neurons of control mice. However, IC261 could decrease the frequency of sEPSCs in both inflammatory pain models [2]. Clinical trial: Up to now, IC261 is still in the preclinical development stage.
[1]. Behrend L, et al. IC261, a specific inhibitor of the protein kinases casein kinase 1-delta and -epsilon, triggers the mitotic checkpoint and induces p53-dependent postmitotic effects. Oncogene. 2000 Nov 9;19(47):5303-5313.
[2] Kurihara T,et al. Alleviation of behavioral hypersensitivity in mouse models of inflammatory pain with two structurally different casein kinase 1 (CK1) inhibitors. Mol Pain.2014 Mar 10;10:17.
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