Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33617

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Title
Heterocyclic substituted cantharidin and norcantharidin analogues-synthesis, protein phosphatase (1 and 2A) inhibition, and anti-cancer activity
Author/Creator
Hill, Timothy A.;  Stewart, Scott G.;  Sauer, Benjamin;  Gilbert, Jayne;  Ackland, Stephen P.;  Sakoff, Jennette A.;  McCluskey, Adam
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Science
Description
Norcantharidin (3) is a potent PP1 (IC₅₀ = 9.0 ± 1.4 μM) and PP2A (IC₅₀ = 3.0 ± 0.4 μM) inhibitor with 3-fold PP2A selectivity and induces growth inhibition (GI₅₀ ~45 μM) across a range of human cancer cell lines including those of colorectal (HT29, SW480), breast (MCF-7), ovarian (A2780), lung (H460), skin (A431), prostate (DU145), neuroblastoma (BE2-C), and glioblastoma (SJ-G2) origin. Until now limited modifications to the parent compound have been tolerated. Surprisingly, simple heterocyclic half-acid norcantharidin analogues are more active than the original lead compound, with the morphilino-substituted (9) being a more potent (IC₅₀ = 2.8 ± 0.10 μM) and selective (4.6-fold) PP2A inhibitor with greater in vitro cytotoxicity (GI₅₀ ~9.6 μM) relative to norcantharidin. The analogous thiomorpholine-substituted (10) displays increased PP1 inhibition (IC₅₀ = 3.2 ± 0 μM) and reduced PP2A inhibition (IC₅₀ = 5.1 ± 0.41 μM), to norcantharidin. Synthesis of the analogous cantharidin analogue (19) with incorporation of the amine nitrogen into the heterocycle further increases PP1 (IC₅₀ = 5.9 ± 2.2 μM) and PP2A (IC₅₀ = 0.79 ± 0.1 μM) inhibition and cell cytotoxicity (GI₅₀ ~3.3 μM). These analogues represent the most potent cantharidin analogues thus reported.
Relation
Bioorganic and Medicinal Chemistry Letters Vol. 17, Issue 12, p. 3392-3397
Publisher Link
http://dx.doi.org/10.1016/j.bmcl.2007.03.093
Date
2007
Publisher
Pergamon
Keyword(s)
cantharidin;  norcantharidin;  small molecule protein phosphatase inhibitors;  PP1;  PP2A;  anti-cancer
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33617
Identifier
ISSN:0960-894X
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Subject
"Bioorganic and Medicinal Chemistry Letters"
 
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