Journal
BIOORGANIC & MEDICINAL CHEMISTRY
Volume 17, Issue 9, Pages 3295-3301Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2009.03.048
Keywords
Carbonic anhydrase; Pyrazole carboxylic acids; Sulfonamide; IC50 value; Hydratase and esterase activities
Funding
- Scientific and Research Council of Turkey (TUBITAK) [TBAG-2376, 106T180]
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Pyrazole carboxylic acid amides of 5-amino-1,3,4-thiadiazole-2-sulfonamide 1 (inhibitor 1) were synthesized from 4-benzoyl-1-(4-nitrophenyl)-5-phenyl-1H-pyrazole-3-carbonyl chloride and 4-benzoyl-1-(3-nitrophenyl)-5-phenyl-1H-pyrazole-3-carbonyl chloride compounds. Human carbonic anhydrase isoenzymes (hCA-I and hCA-II) were purified from erythrocyte cells by the affinity chromatography. The inhibitory effects of inhibitor 1, acetazolamide (AAZ), and of 16 newly synthesized amides (8-11, 12a-f, 13a-c, 14a-b, and 15) on hydratase and esterase activities of these isoenzymes have been studied in vitro. The average IC50 values of the new compounds (8-11,12a-f, 13a-c, 14a-b, and 15) for hydratase activity ranged from 3.25 to 4.75 mu M for hCA-I and from 0.055 to 2.6 mu M for hCA-II. The mean IC50 values of the same inhibitors for esterase activity were in the range of 2.7-6.6 mu M for hCA-I ( with the exception of inhibitor 10, which did not inhibit the esterase activity of hCA-I) and of 0.013-4.2 mu M for hCA-II. The K-i values for new compounds (8-11, 12a-f, 13a-c, 14a-b, and 15) were observed well below that of the parent compound inhibitor 1 and were also comparable to that of AAZ under the same experimental conditions. The comparison of newly synthesized amides to inhibitor 1 and to AAZ indicated that the new derivatives preferentially inhibit hCA-II and are more potent inhibitors of hCA-II than the parent inhibitor 1 and AAZ. (C) 2009 Elsevier Ltd. All rights reserved.
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