carbonic anhydrases

Benzenesulfonamide (Benzosulfonamide) ia an inhibitor of carbonic anhydrases.

Dorzolamide hydrochloride (MK507 hydrochloride) is the hydrochloride salt form of dorzolamide, an inhibitor of carbonic anhydrase, a zinc-containing enzyme that catalyzes the rapid conversion of carbon dioxide and water into carbonic acid, protons and bicarbonate ions. Distributed throughout many cells and tissues, various carbonic anhydrases play important roles in mineral and metabolic homeostasis.

Benzthiazide (Lemazide) is used in the therapy of edema and hypertension. Like other thiazides, benzthiazide accelerates water loss from the body (diuretics). They inhibit Na+ Cl- reabsorption from the distal convoluted tubules in the kidneys. Thiazides also cause loss of potassium and an increase in serum uric acid. Thiazides are often used to treat hypertension, but their hypotensive effects are not necessarily due to their diuretic activity. Thiazides have been shown to prevent hypertension-related morbidity and mortality although the mechanism is not fully understood. Thiazides cause vasodilation by activating calcium-activated potassium channels (large conductance) in vascular smooth muscles and inhibiting various carbonic anhydrases in vascular tissue.

hCA VEGFR-2-IN-4 (compound 15b), an indolinylbenzenesulfonamide, serves as a potential dual inhibitor targeting cancer-related human carbonic anhydrases hCA IX XII and vascular endothelial growth factor receptor 2 (VEGFR-2). It exhibits an IC50 value of 0.811 µM against VEGFR-2 and shows high affinity for hCAs, with inhibition constants (Ki) of 3.8 nM for hCA XII, 6.2 nM for hCA IX, 19.8 nM for hCA II, and 35.5 nM for hCA I. Additionally, the compound demonstrates antiproliferative effects on breast cancer cells overexpressing VEGFR-2 [1].

N-desethyl Brinzolamide is an active metabolite of the carbonic anhydrase (CA) inhibitor brinzolamide .1It inhibits CAII and CAIV activities (IC50s = 1.28 and 128 nM, respectively). 1.Kim, C.-Y., Whittington, D.A., Chang, J.S., et al.Structural aspects of isozyme selectivity in the binding of inhibitors to carbonic anhydrases II and IVJ. Med. Chem.45(4)888-893(2002)

Compound 167 (Antibacterial agent 167), identified as an inhibitor of pathogenic bacterial carbonic anhydrases, effectively inhibits the growth of N. gonorrhea strains. The inhibition occurs at concentrations between 16 to 64 µg mL [1].

hCAIX XII-IN-8 (compound 3g) is a potent inhibitor of the human carbonic anhydrases (CAs) IX and XII, with inhibition constants (K i) of 8.5 nM for CA IX and 6.7 nM for CA XII. It demonstrates significant inhibitory efficacy particularly against tumor-associated, membrane-bound isoforms hCA IX and XII, while exhibiting high selectivity over the cytosolic isoforms hCA I and II [1].

Carbonic anhydrase inhibitor 4 is a photoprobe that inhibits the activity of carbonic anhydrase. It specifically targets human carbonic anhydrases, including hCA I-XIV, with K i values ranging from 640-1166 nM [1].