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J Enzyme Inhib Med Chem ; 35(1): 1003-1010, 2020 Dec.
Article in English | MEDLINE | ID: mdl-32336172

ABSTRACT

The Carbonic Anhydrase (CA, EC 4.2.1.1) activating properties of histamine have been known for a long time. This compound has been extensively modified but only in few instances the imidazole ring has been replaced with other heterocycles. It was envisaged that the imidazoline ring could be a bioisoster of the imidazole moiety. Indeed, we report that clonidine, a 2-aminoimidazoline derivative, was found able to activate several human CA isoforms (hCA I, IV, VA, VII, IX, XII and XIII), with potency in the micromolar range, while it was inactive on hCA II. A series of 2-aminoimidazoline, structurally related to clonidine, was then synthesised and tested on selected hCA isoforms. The compounds were inactive on hCA II while displayed activating properties on hCA I, VA, VII and XIII, with KA values in the micromolar range. Two compounds (10 and 11) showed some preference for the hCA VA or VII isoforms.


Subject(s)
Carbonic Anhydrase Inhibitors/pharmacology , Carbonic Anhydrases/metabolism , Clonidine/pharmacology , Imidazoles/pharmacology , Carbonic Anhydrase Inhibitors/chemical synthesis , Carbonic Anhydrase Inhibitors/chemistry , Clonidine/chemistry , Dose-Response Relationship, Drug , Humans , Imidazoles/chemical synthesis , Imidazoles/chemistry , Isoenzymes/antagonists & inhibitors , Isoenzymes/metabolism , Molecular Structure , Structure-Activity Relationship
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