title: A structure-activity study for the inhibition of metalloproteinase-9 activity and gene expression by analogues of gallocatechin-3-gallate.
abstract: Catechins are able to modulate the gelatinolytic activity of matrix metalloproteinase-9 (MMP-9) by reducing its release from macrophages. Gallocatechins decrease MMP-9 secretion by lowering MMP-9 promoter activity and mRNA levels. The effect appears to be dependent on some structural and stereochemical requirements. In this study, the relationship between chemical structure and activity was studied by testing the effect of analogues of (+/-)-gallocatechin-3-gallate (+/-)-GCG, selectively deprived of hydroxyl groups, on MMP-9 activity, transcription, and secretion. Our results indicate that (+/-)-GCG and (+/-)-catechin-3-gallate are characterized by a substitution pattern compatible with direct inhibition of MMP-9 activity. Conversely, when transcription was the target, (+/-)-trans-3-flavanol-3-benzoate, lacking all the hydroxyl groups, was the most effective both in lowering MMP-9 promoter activity and consequently protein secretion, and in inhibiting nuclear-factor-kappaB-driven transcription. Our results suggest that the structural requirements for enzyme inhibition are different from those necessary for targeting gene expression.
authors.affiliation: Department of Pharmacological Sciences, University of Milan, Via Balzaretti 9, 20133, Milan, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Dell'agli
authors.forename: S
authors.initials: S
authors.lastname: Bellosta
authors.forename: L
authors.initials: L
authors.lastname: Rizzi
authors.forename: G V
authors.initials: GV
authors.lastname: Galli
authors.forename: M
authors.initials: M
authors.lastname: Canavesi
authors.forename: F
authors.initials: F
authors.lastname: Rota
authors.forename: R
authors.initials: R
authors.lastname: Parente
authors.forename: E
authors.initials: E
authors.lastname: Bosisio
authors.forename: S
authors.initials: S
authors.lastname: Romeo
mesh_terms: D000818:Animals; D002392:Catechin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D002460:Cell Line; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D008264:Macrophages / Q000187:drug effects; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism; D061965:Matrix Metalloproteinase Inhibitors; D051379:Mice; D008810:Mice, Inbred C57BL; D015394:Molecular Structure; D016328:NF-kappa B / Q000187:drug effects / Q000378:metabolism; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D019714:Tissue Inhibitor of Metalloproteinases / Q000494:pharmacology*
chemical_list: D061965:Matrix Metalloproteinase Inhibitors; D016328:NF-kappa B; D019714:Tissue Inhibitor of Metalloproteinases; C417940:gallocatechin gallate; D002392:Catechin; D020780:Matrix Metalloproteinase 9