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  • Title: Carbonic anhydrase inhibitors: bioreductive nitro-containing sulfonamides with selectivity for targeting the tumor associated isoforms IX and XII.
    Author: D'Ambrosio K, Vitale RM, Dogné JM, Masereel B, Innocenti A, Scozzafava A, De Simone G, Supuran CT.
    Journal: J Med Chem; 2008 Jun 12; 51(11):3230-7. PubMed ID: 18481843.
    Abstract:
    2-Substituted-5-nitro-benzenesulfonamides incorporating a large variety of secondary/tertiary amines were explored as inhibitors of the zinc enzyme carbonic anhydrase (CA, EC 4.2.1.1), with the aim of designing bioreductive inhibitors targeting the hypoxia overexpressed, tumor-associated isozymes. The compounds were ineffective inhibitors of the cytosolic isoform I, showed a better inhibition of the physiologically relevant CA II (KIs of 8.8-4975 nM), and strongly inhibited the tumor-associated CA IX and XII (KIs of 5.4-653 nM). Some of these compounds showed excellent selectivity ratios for the inhibition of the tumor-associated isozymes over the cytosolic ones (in the range of 10-1395). The X-ray crystal structure of the adduct of hCA II with the lead molecule 2-chloro-5-nitro-benzenesulfonamide as well as molecular modeling studies for interaction with hCA IX afforded a better understanding of factors governing the discrimination of the two isoforms for this type of bioreductive compound targeting specifically hypoxic tumors.
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