Uses
IWP-2 is an inactivator of Porcn function; inhibitor of Wnt production. IWP-2 is useful in the treatment diseases and conditions such as cancer, degenerative diseases, type II diabetes and osteopetrosis.
Definition
ChEBI: N-(6-methyl-1,3-benzothiazol-2-yl)-2-[(4-oxo-3-phenyl-6,7-dihydrothieno[3,2-d]pyrimidin-2-yl)thio]acetamide is an organonitrogen heterocyclic compound, an organic heterobicyclic compound and an organosulfur heterocyclic compound.
General Description
A cell-permeable benzothiazolyl-acetamide compound that inhibits the cellular Wnt processing and secretion via selective blockage of MBOAT (membrane-bound O-acyltranferase) family member Porcn- (Porcupine) mediated Wnt palmitoylation. IWP-2 does not affect Wnt/β-catenin signaling pathway in general and, unlike IWR-1-endo (Cat. No. 681669), displays no effect against Wnt-stimulated cellular responses. Also available as a 10 mM solution in DMSO (Cat. No. 506072).
Biochem/physiol Actions
IWP-2 is an inactivator of Porcn function; inhibitor of Wnt production. Wnt/b-catenin (‘canonical′) pathway maintains transcriptional programs that enable stem cells to remain multipotent. Hyperactivation of the Wnt/b-catenin pathway leads to disease stage. IWP-2 inhibits Wnt production. It appears that IWP inactivates Porcn function either by directly inhibiting the Porcn active site or by modulating the function of a Porcn regulator. Porcn is a member of the membrane-bound O-acyltransferase (MBOAT) family, which adds a palmitoyl group to Wnt proteins that is essential to their signaling ability and is required for Wnt secretion. IWP-2 is useful in both regenerative medicine and anticancer efforts.
in vivo
in order to test the in vivo activity of iwp-2, the authors turned to a simple and rapid assay of wnt/b-catenin pathway activity: regeneration of the zebrafish caudal fin following resection. the addition of iwp-2 to the aquarium water of zebrafish failed to suppress fin regeneration after mechanical resection, which suggests either that iwp-2 have poor bioavailability or that the determinants in the gene product that they target are not conserved in zebrafish [1].
IC 50
27 nm for wnt pathway activity
References
1) Chen et al. (2009), Small molecule-mediated disruption of Wnt-dependent signaling in tissue regeneration and cancer; Nature Chem. Biol., 5 100
2) Lian et al. (2012), Robust Cardiomyocyte differentiation from human pluripotent stem cells via temporal modulation of canonical Wnt signaling; Proc. Natl. Acad. Sci. USA, 109 1848
3) ten Berge et al. (2011), Embryonic stem cells require Wnt proteins to prevent differentiation to epiblast stem cells; Nature Cell. Biol., 13 1070
4) Uyama et al. (2013), Wasf2: a novel target of intermittent parathyroid hormone administration; Int. J. Mol. Med., 31 1243
