title: Antiplasmin activity of natural occurring polyphenols.
abstract: The equilibrium between proteolytic enzymes and their cognate inhibitors is crucial in a number of physiological as well as pathological processes, including cancer, inflammatory processes and thrombosis. Therefore, both synthetic and natural small molecule inhibitors are object of extensive studies as drugs in the treatment of these pathologies. Two natural occurring polyphenolic compounds, representative of glycosylated and unglycosylated flavonoid structures, namely quercetin and rutin, were thereby tested as potential ligands of plasmin(ogen), a serine (pro)protease, whose role in tumor cell invasion and migration has been reported. Quercetin showed a ten folds higher affinity with plasmin with respect to rutin in terms of equilibrium dissociation constant, both compounds acting as in vitro moderate reversible inhibitors; additionally, quercetin and rutin prevented plasmin-incubated BB1 cells from releasing E-cadherin fragment to a different extent, respectively. Furthermore, a feasible mechanism of interaction was analyzed and discussed using a molecular modeling approach.
authors.affiliation: MCAB Department, University of Camerino, 62032, Camerino (MC), Italy. matteo.mozzicafreddo@unicam.it
authors.forename: Matteo
authors.initials: M
authors.lastname: Mozzicafreddo
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Cuccioloni
authors.forename: Laura
authors.initials: L
authors.lastname: Bonfili
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Eleuteri
authors.forename: Evandro
authors.initials: E
authors.lastname: Fioretti
authors.forename: Mauro
authors.initials: M
authors.lastname: Angeletti
mesh_terms: D015153:Blotting, Western; D002460:Cell Line; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D007700:Kinetics; D008958:Models, Molecular; D010636:Phenols / Q000737:chemistry / Q000494:pharmacology*; D059808:Polyphenols; D013816:Thermodynamics; D000979:alpha-2-Antiplasmin / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; D000979:alpha-2-Antiplasmin