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8-Halo-substituted naphtho[2,3-b]thiophene-4,9-diones as Redox-Active Inhibitors of Keratinocyte Hyperproliferation With Reduced Membrane-Damaging Properties

8-Halo-substituted naphtho[2,3-b]thiophene-4,9-diones as Redox-Active Inhibitors of Keratinocyte Hyperproliferation With Reduced Membrane-Damaging Properties

Cathrin Lindenschmidt, Dirk Krane, Silke Vortherms, Lars Hilbig, Helge Prinz, Klaus Müller

Eur J Med Chem. 2016 Mar 3;110:280-90.

PMID: 26840368

Abstract:

A series of 8-chloronaphtho[2,3-b]thiophene-4,9-diones and also some 8-bromo analogues were prepared. The compounds were evaluated for their potencies to suppress keratinocyte hyperproliferation using the human keratinocyte line HaCaT as the primary test system. Structure-activity relationship studies revealed that replacement of the phenolic group of an earlier series with an 8-halogen atom retained the inhibitory potency against keratinocyte hyperproliferation with IC50 values in the submicromolar range. 8-Chloro-substitution led to inhibitors that were more potent than their bromo analogues. Concomitantly, halo-substitution eliminated membrane-damaging properties as assessed by LDH release from the cytoplasm of the keratinocytes which, in contrast, were induced by the corresponding phenolic analogues. Finally, selective compounds were characterized for their ability to participate in redox cycling to generate superoxide in enzymatic and keratinocyte-based studies.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP551907643	Thiophene-4		551907-64-3	Price

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