Derivati a nucleo benzo[d]isotiazol-3(2H)-one-1,1-diossido e loro impiego nel trattamento di tumori

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Overexpression of the transmembrane carbonic anhydrase isoforms IX and XII in the inflamed synovium

Juvenile idiopathic arthritis (JIA) is the most common form of chronic rheumatic disease affecting children worldwide, with some features similar to adult rheumatoid arthritis (RA). In the present study, we aim at investigating novel markers that will allow in the future for tailored, more personalized treatment strategies. Hence, taking notice of several reports proving the role of local acidosis as a causal link between inflammatory diseases and related pain, and the involvement of several carbonic anhydrases (CA, EC 4.2.1.1) isoforms in articular diseases, we evaluated in JIA patients the expression of these metalloenzymes. We identified that JIA patients show high levels of active CA IX and XII isoforms. Our results represent the first evidence of the identification of these enzymes as potential therapeutic targets and development of novel innovative therapies for arthritis, also considering that the two isoforms are validated antitumor target

Identification and characterization of the a-CA in the outer membrane vesicles produced by Helicobacter pylori

The genome of Helicobacter pylori encodes for carbonic anhydrases (CAs, EC 4.2.1.1) belonging to the aand b-CA classes, which together with urease, have a pivotal role in the acid acclimation of the microorganism within the human stomach. Recently, in the exoproteome of H. pylori, a CA with no indication of the corresponding class was identified. Here, using the protonography and the mass spectrometry, a CA belonging to the a-class was detected in the outer membrane vesicles (OMVs) generated by planktonic and biofilm phenotypes of four H. pylori strains. The amount of this metalloenzyme was higher in the planktonic OMVs (pOMVs) than in the biofilm OMVs (bOMVs). Furthermore, the content of a-CA increases over time in the pOMVs. The identification of the a-CA in pOMVs and bOMVs might shed new light on the role of this enzyme in the colonization, survival, persistence, and pathogenesis of H. pylor

Carbonic anhydrase inhibitors. Part 41. Quantitative structure-activity correlations involving kinetic rate constants of 20 sulfonamide inhibitors from a non-congeneric series

A quantitative structure-activity relationship study is presented for 20 sulfonamide inhibitors of carbonic anhydrase. These drugs do not form a classical congeneric series, in that the only common factor is the sulfonamide group, which is attached to a variety of substituted aromatic and hetero-aromatic nuclei. The important factors were local factors such as Mulliken charge on atoms of the sulfonamide group, and global factors such as the size and shape of the molecule, its calculated frontier orbital energies, and its lipophilicity. Good correlations were obtained with the equilibrium constant and the kinetic association rate constant, but not with the kinetic dissociation rate constant

Semi-empirical atomic charges and dipole moments in hypervalent sulfonamide molecules: descriptors in QSAR studies

The Mulliken and ESP-based atomic charges and dipole moments have been calculated for a group of substituted methanesulfonamides by several ab initio and semi-empirical methods, in order to find the most reliable semi-empirical method of calculating these quantities in hypervalent molecules. It was found that the ab initio Mulliken charges on the sulfonamide H were meaningless, and that the ab initio ESP-based atomic charges calculated using any non-minimal basis set well reproduced the dipole moments. The semi-empirical results were less satisfactory, but in general, the ESP-based charges were more promising than the Mulliken charges, and CNDO-based dipole moments agreed better with ab initio dipole moments than with those calculated by AM1 or PM3. All charges for hypervalent molecules such as sulfonamides, calculated with semi-empirical methods, should be treated with caution

Carbonic anhydrase inhibitors. Part 24. A quantitative structure-activity relationship study of positively charged sulfonamide inhibitors

A quantitative structure-activity relationship (QSAR) study is presented for 28 carbonic anhydrase inhibitors (CAIs), derivatives of tri-, tetra- and penta-substituted 1-(2-sulfonamido-1,3,4-thiadiazol-5-yl)pyridinium perchlorates. Several of these derivatives are new compounds and their synthesis and properties are also reported. The conclusion of the study is that activity is greatly modulated by electronic effects on the pyridinium ring. The most significant effects were enhancement of activity with increased positive charge on this ring, weakening of activity with increasing HOMO energy, and a dependence on anisotropic polarizability which may be attributable to London forces