title: Effects of 'casoparan', a peptide isolated from casein hydrolysates with mastoparan-like properties.
abstract: Casein, a protein found in milk of several species, is divided into different chains from 19 to 25 kDa. Casein is also considered as a source of amino acids and generating peptides with biological activities such as opiate, immunostimulating, antibacterial, peptidase inhibitors, among others. In this work, Sephadex G-10 chromatography followed by high-performance liquid chromatography isolation purified NZCase TT, an industrial culture media for tetanus toxin production. In the first step, four pools were isolated and tested in different assays: isolated smooth muscle assay (guinea pig ileum, rat uterus), phagocytosis in vitro of opsonized sheep red blood cells, and hydrogen peroxide (H2O2) release from mouse peritoneal macrophages. Pool III was the main active pool being able to potentiate bradykinin action in guinea pig ileum, stimulating phagocitic activity by resident macrophages and increasing H2O2 release from macrophages previously activated with bacille Calmette Guérin. Using mass spectra the primary structure of the main peptide from pool III was obtained--INKKI, which corresponds to beta-casein fragment 26-30. The immunostimulating action is probably related to a direct action in macrophage cells.
authors.affiliation: Biochemistry and Biophysics Laboratory, Butantan Institute, São Paulo, Brazil. lebrun@butantan.gov.br
authors.forename: Ivo
authors.initials: I
authors.lastname: Lebrun
authors.forename: Valéria
authors.initials: V
authors.lastname: Cavallaro
authors.forename: Luiz
authors.initials: L
authors.lastname: Juliano
authors.forename: Maria A
authors.initials: MA
authors.lastname: Juliano
authors.forename: Maria C C
authors.initials: MC
authors.lastname: de Sousa e Silva
mesh_terms: D000818:Animals; D001920:Bradykinin / Q000502:physiology; D002364:Caseins / Q000737:chemistry* / Q000378:metabolism; D002845:Chromatography; D002851:Chromatography, High Pressure Liquid; D004912:Erythrocytes; D005260:Female; D005769:Gastrointestinal Motility / Q000187:drug effects; D006168:Guinea Pigs; D006861:Hydrogen Peroxide / Q000378:metabolism; D006868:Hydrolysis; D007082:Ileum / Q000187:drug effects / Q000378:metabolism / Q000502:physiology; D066298:In Vitro Techniques; D036341:Intercellular Signaling Peptides and Proteins; D017737:Macrophages, Peritoneal / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D009130:Muscle, Smooth / Q000187:drug effects; D009842:Oligopeptides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D010446:Peptide Fragments / Q000494:pharmacology; D010455:Peptides; D010587:Phagocytosis / Q000187:drug effects; D051381:Rats; D012756:Sheep / Q000097:blood; D013057:Spectrum Analysis; D014599:Uterus / Q000187:drug effects; D014862:Wasp Venoms / Q000737:chemistry*
chemical_list: D002364:Caseins; D036341:Intercellular Signaling Peptides and Proteins; D009842:Oligopeptides; D010446:Peptide Fragments; D010455:Peptides; D014862:Wasp Venoms; C499966:casoparan; C037500:mastoparan; D006861:Hydrogen Peroxide; D001920:Bradykinin