title: Inhibition of contact hypersensitivity reaction to picryl chloride: effect of small molecular weight peptidomimetic compounds possessing inhibitory activity against metalloproteinases.
abstract: We have studied the effect of small molecular weight inhibitors of snake venom metalloproteinases (SVMP) and matrix metalloproteinases (MMPs) on the induction and effector phase of the contact hypersensitivity reaction (CHR) in a mouse model. Identification of nonsteroid small molecules is very important for the development of new anti-inflammatory drugs. The compounds that we tested were synthetically modified tripeptides (peptidomimetic compounds) POL-257, POL-509, POL-443, POL-491, and POL-647, with structures based on natural occurring peptides in snake venom. A well-known hydroxamate-based inhibitor of the MMPs, Batimastat (BB-94), was also used. We have shown that these peptidomimetics possess in vitro inhibitory activity against the MMP-2 (gelatinase-A), MMP-9 (gelatinase-B), and MMP-3 (stromelysin). They also inhibit metalloproteinases purified from the venom of Crotalus adamanteus and C. atrox snakes, which are very similar to the so-called A Desintegrine, A Metalloproteinase (ADAMs) enzymes. When injected intraperitonealy before the topical application of the contact sensitizer (picryl chloride) or before the challenge, these compounds significantly inhibited the development of CHR. BB-94 at doses 0.4 and 4 mg/kg before the sensitization or before the challenge almost completely abrogated the reaction. POL-257 and POL-443 were among the most active peptidomimetics tested. They inhibited the inflammatory reaction up to 70-80%, when applied either immediately before sensitization or before challenge. POL-509, a methylated derivative of POL-257, inhibited the CHR to 40-50% when administered at either challenge or sensitization. However, when applied 24 h before the challenge, it completely abrogated the inflammatory reaction. The results show that these small molecular weight peptidomimetic compounds, as well as BB-94, are able to significantly inhibit the CHR. This finding opens possibilities for using metalloproteinase inhibitors in the treatment of allergic contact dermatitis and other inflammatory diseases.
authors.affiliation: Department of Biology, NSTA, II University of Rome, Tor Vergata, Italy. mattei@uniroma2.it
authors.forename: M
authors.initials: M
authors.lastname: Mattei
authors.forename: E
authors.initials: E
authors.lastname: Carnieri
authors.forename: V
authors.initials: V
authors.lastname: Politi
authors.forename: S
authors.initials: S
authors.lastname: D'Alessio
authors.forename: A
authors.initials: A
authors.lastname: Sella
authors.forename: M
authors.initials: M
authors.lastname: Cassol
authors.forename: A
authors.initials: A
authors.lastname: Robeva
authors.forename: V
authors.initials: V
authors.lastname: Colizzi
authors.forename: T
authors.initials: T
authors.lastname: Sumerska
mesh_terms: D000818:Animals; D003435:Crotalid Venoms / Q000494:pharmacology* / Q000627:therapeutic use; D017839:Crotalus; D003877:Dermatitis, Contact / Q000201:enzymology* / Q000517:prevention & control*; D004791:Enzyme Inhibitors / Q000302:isolation & purification / Q000494:pharmacology / Q000627:therapeutic use; D008297:Male; D008666:Metalloendopeptidases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018716:Molecular Mimicry; D008970:Molecular Weight; D009842:Oligopeptides / Q000494:pharmacology* / Q000627:therapeutic use; D010853:Picryl Chloride / Q000494:pharmacology*; D011761:Pyrrolidonecarboxylic Acid / Q000031:analogs & derivatives
chemical_list: D003435:Crotalid Venoms; D004791:Enzyme Inhibitors; D009842:Oligopeptides; C081973:pyroglutamyl-leucyl-tryptophan methyl ester; D008666:Metalloendopeptidases; D011761:Pyrrolidonecarboxylic Acid; D010853:Picryl Chloride