Biological Activity of CGP 57380

CGP 57380 is a cell-permeable pyrazolo-pyrimidine compound that acts as a selective inhibitor of Mnk1 (IC50 = 2.2 μM) with no inhibitory activity against p38, JNK1, ERK1/2, PKC, or Src-like kinases.
IC50 value: 2.2 uM
Target: Mnk1
in vitro: Inhibition of MNK1 activity by a specific inhibitor (CGP57380) enhanced differentiation of HL60 and 32D cells, further suggesting a role for MNK1 in the myeloid differentiation. CGP 57380 effectively inhibits eIF4E phosphorylation (IC50 = 3 μM) by MNK1 in 293 human embryonic kidney cells and serves as a useful tool in studying Mnk1-mediated cellular signaling. CGP 57380 is an inhibitor of ARK-2, BRSK2, ChoK, Dyrk3, Lck, Mnk2 and SGK.

References on CGP 57380

[1]. Worch J, et al. The serine-threonine kinase MNK1 is post-translationally stabilized by PML-RARalpha and regulates differentiation of hematopoietic cells. Oncogene. 2004 Dec 9;23(57):9162-72.

[2]. Morley SJ, et al. Phosphorylation of eukaryotic initiation factor (eIF) 4E is not required for de novo protein synthesis following recovery from hypertonic stress in human kidney cells.

[3]. Knauf U, et al. Negative regulation of protein translation by mitogen-activated protein kinase-interacting kinases 1 and 2. Mol Cell Biol. 2001 Aug;21(16):5500-11.