Carbonic anhydrase inhibitors: The first selective, membrane-impermeant inhibitors targeting the tumor-associated isozyme IX

S. Pastorekova, A. Casini, A. Scozzafava, D. Vullo, J. Pastorek, C.T. Supuran

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Abstract

The inhibition of the tumor-associated transmembrane carbonic anhydrase IX (CA IX) isozyme possessing an extracellular active site has been investigated with a series of positively-charged, pyridinium derivatives of sulfanilamide, homosulfanilamide and 4-aminoethylbenzenesulfonamide. Inhibition data for the physiologically relevant isozymes I and II (cytosolic forms) and IV (membrane-bound) were also provided for comparison. A very interesting inhibition profile against CA IX with these sulfonamides has been observed. Several nanomolar (Ki's in the range of 6-54 nM) CA IX inhibitors have also been detected. Because CA IX is a highly active isozyme predominantly expressed in tumor tissues with bad prognosis of disease progression, this finding is very promising for the potential design of CA IX-specific inhibitors with applications as anti-tumor agents. This is the first report of inhibitors that may selectively target CA IX, due to their membrane-impermeability and high affinity for this clinically relevant isozyme. © 2003 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)869-873
Number of pages5
JournalBioorganic & Medicinal Chemistry Letters
Volume14
Issue number4
DOIs
Publication statusPublished - Feb-2004
Externally publishedYes

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