LJI308 is potent pan-RSK inhibitor that targets RSK N-terminal kinase domain (NTKD) ATP-binding site (IC50/[ATP] = 6 nM/5 μM/RSK1, 4 nM/20 μM/RSK2, 13 nM/10 μM/RSK3), exhibiting similary binding affinity toward RSK1-4, but much reduced inhibitory potency against S6K1 (IC50 = 0.8 μM), MEK4 (IC50 >10 μM), and HIP kinase 1 (IC50 >1 μM). LJI308 effectivelfy reduces cellular Y-box binding protein-1 (YB1) Ser102 (EC50 = 0.2-0.3 μM; MDA-MB-231 and H358 cells), but not ribosomal S6 protein (S6RP) S235/236, phosphorylation level and selectively inhibits the growth of YB1-overpressing HTRY-LT triple-negative breast cancer (TNBC) cells, but not the parental non-tumorigenic human mammary epithelial cell (HMEC) line HTRZ (% inhibition = 6.8%/HTRZ, 88%/HTRY-LT1, 66%/HTRY-LT2 in 8 days; 5 μM at 0 and 96 hr).
LJI308 is potent pan-RSK inhibitor that targets RSK N-terminal kinase domain ATP-binding site and inhibits YB1-dependent growth of cncer cells.
Molecular cancer research : MCR, 12(5), 803-812 (2014-02-21)
The p90 ribosomal S6 kinase (RSK) family of serine/threonine kinases is expressed in a variety of cancers and its substrate phosphorylation has been implicated in direct regulation of cell survival, proliferation, and cell polarity. This study characterizes and presents the
The triple-negative breast cancer (TNBC) subtype is enriched in cancer stem cells (CSCs) and clinically correlated with the highest rate of recurrence. Several studies implicate the RSK pathway as being pivotal for the growth and proliferation of CSCs, which are
Journal of medicinal chemistry, 58(17), 6766-6783 (2015-08-14)
While the p90 ribosomal S6 kinase (RSK) family has been implicated in multiple tumor cell functions, the full understanding of this kinase family has been restricted by the lack of highly selective inhibitors. A bis-phenol pyrazole was identified from high-throughput
The causative agent of the coronavirus disease 2019 (COVID-19) pandemic, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has infected millions and killed hundreds of thousands of people worldwide, highlighting an urgent need to develop antiviral therapies. Here we present a
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