title: Phototriggered release of tetrapeptide AAPV from coumarinyl and pyrenyl cages.
abstract: Ala-Ala-Pro-Val (AAPV) is a bioactive tetrapeptide that inhibits human neutrophil elastase, an enzyme involved in skin chronic inflammatory diseases like psoriasis. Caged derivatives of this peptide were prepared by proper N- and C-terminal derivatisation through a carbamate or ester linkage, respectively, with two photoactive moieties, namely 7-methoxycoumarin-2-ylmethyl and pyren-2-ylmethyl groups. These groups were chosen to assess the influence of the photosensitive group and the type of linkage in the controlled photo release of the active molecule. The caged peptides were irradiated at selected wavelengths of irradiation (254, 300, and 350 nm), and the photolytic process was monitored by HPLC-UV. The results established the applicability of the tested photoactive groups for the release of AAPV, especially for the derivative bearing the carbamate-linked pyrenylmethyl group, which displayed the shortest irradiation times for the release at the various wavelengths of irradiation (ca. 4 min at 254 nm, 8 min at 300 nm and 46 min at 350 nm).
authors.affiliation: Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.
authors.forename: Filipa C
authors.initials: FC
authors.lastname: Santos
authors.affiliation: Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.
authors.forename: Ana M S
authors.initials: AMS
authors.lastname: Soares
authors.affiliation: Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.
authors.forename: M Sameiro T
authors.identifier: 0000-0003-2048-1190
authors.initials: MST
authors.lastname: Gonçalves
authors.affiliation: Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal. spc@quimica.uminho.pt.
authors.forename: Susana P G
authors.identifier: 0000-0001-7915-4720
authors.initials: SPG
authors.lastname: Costa
mesh_terms: D003374:Coumarins / Q000737:chemistry*; D009842:Oligopeptides / Q000737:chemistry*; D055668:Photochemical Processes; D011721:Pyrenes / Q000737:chemistry*
chemical_list: D003374:Coumarins; D009842:Oligopeptides; D011721:Pyrenes; C030984:pyrene; C030123:coumarin
keywords: AAPV; Caged peptide; Coumarin; Photorelease; Pyrene