title: Substance P inactivation by aqueous humor.
abstract: Degradation of substance P was studied in dog and rabbit aqueous humor. Substance P inactivation was followed by the bioassay using the isolated guinea pig ileum. Both rabbit and dog aqueous humor inactivated substance P. Rabbit aqueous humor inactivated the peptide faster than dog aqueous humor. Inactivation of substance P by rabbit aqueous humor was inhibited by diisopropylfluorophosphate while other enzyme inhibitors tested (captopril, phosphoramidon, mersalyl acid and p-chloromercuriphenyl-sulphonate) were practically ineffective or had a partial inhibitory effect. Our results suggest that serine proteases, rather than other peptidases, play a major role in the inactivation of substance P in aqueous humor.
authors.affiliation: Department of Pharmacology, Toxicology and Clinical Pharmacology, University of Novi Sad, R. Serbia, F.R. Yugoslavia.
authors.forename: R
authors.initials: R
authors.lastname: Igić
mesh_terms: D002731:4-Chloromercuribenzenesulfonate / Q000494:pharmacology; D000818:Animals; D001082:Aqueous Humor / Q000378:metabolism*; D001681:Biological Assay; D004285:Dogs; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D007531:Isoflurophate / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects; D011817:Rabbits; D013373:Substance P / Q000032:analysis / Q000037:antagonists & inhibitors* / Q000494:pharmacology
chemical_list: D007531:Isoflurophate; D013373:Substance P; D002731:4-Chloromercuribenzenesulfonate