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Some proteases involved in extracellular matrix degradation are instrumental not only in overcoming tissue barriers to allow normal extravasation of hematic cells, but also in facilitating pathological processes such as inflammation, angiogenesis and tumor invasion. The possibility of blocking these enzymes has led to the development of synthetic inhibitors, though clinical trials have been disappointing...
Flavanols-a class of plant polyphenols abundant in tea leaves and grape seeds and skins-have been found to inhibit some matrix-proteases instrumental in inflammation and cancer invasion, such as leukocyte elastase (LE) and gelatinases. In order to establish the relationship between chemical structure and activity, 27 different flavonoids (antocyanidins, dihydrochalcones, dihydroflavonols, flavanolignans,...
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