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Published on: May 2, 2018
GSK3beta Inhibitor Peptide Protects Mice from LPS-induced Endotoxin Shock
Ryeojin Ko1, Hyun Duk Jang, Soo Young Lee
1Division of Life and Pharmaceutical Sciences, Center for Cell Signaling & Drug Discovery Research, Ewha Womans University, Seoul 120-750, Korea.
Background:
Glycogen synthase kinase 3beta (GSK3beta) is a ubiquitous serine/threonine kinase that is regulated by serine phosphorylation at 9. Recent studies have reported the beneficial effects of a number of the pharmacological GSK3beta inhibitors in rodent models of septic shock. Since most of the GSK3beta inhibitors are targeted at the ATP-binding site, which is highly conserved among diverse protein kinases, the development of novel non-ATP competitive GSK3beta inhibitors is needed.
Methods:
Based on the unique phosphorylation motif of GSK3beta, we designed and generated a novel class of GSK3beta inhibitor (GSK3i) peptides. In addition, we investigated the effects of a GSK3i peptide on lipopolysaccharide (LPS)-stimulated cytokine production and septic shock. Mice were intraperitoneally injected with GSK3i peptide and monitored over a 7-day period for survival.
Results:
We first demonstrate its effects on LPS-stimulated pro-inflammatory cytokine production including interleukin (IL)-6 and IL-12p40. LPS-induced IL-6 and IL-12p40 production in macrophages was suppressed when macrophages were treated with the GSKi peptide. Administration of the GSK3i peptide potently suppressed LPS-mediated endotoxin shock.
Conclusion:
Collectively, we present a rational strategy for the development of a therapeutic GSK3i peptide. This peptide may serve as a novel template for the design of non-ATP competitive GSK3 inhibitors.
