Abstract
Reaction of 6-/7-hydroxycoumarin with metronidazole afforded conjugates which incorporate two interesting chemotypes which may inhibit carbonic anhydrases (CAs, EC 4.2.1.1) due to the presence of the coumarin moiety and possess radiosensitizing effects due to the presence of the nitroazole. Another dual action compound, which may act both as CA inhibitor as well as monocarboxylate transporter inhibitor, is 3-cyano-7-hydroxy-coumarin. These compounds have been investigated as inhibitors of 11 human CA isoforms. Submicromolar inhibition was observed against hCA VA, hCA VB, hCA VI, hCA VII, hCA IX, hCA XII and hCA XIV, whereas isoforms hCA I, II and XIII were not inhibited by these compounds. These coumarins thus act as isoform-selective CA inhibitors with the possibility to target isoforms involved in pathologies such as obesity (CA VA/VB) or cancer (CA IX and XII) without inhibiting the physiologically dominant, highly abundant hCA I and II.
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