title: Identification of the bioactive peptide PEC-60 in brain.
abstract: PEC-60 is a 60-residue peptide originally isolated from pig intestine. It inhibits glucose-induced insulin secretion from perfused pancreas in a hormonal manner and also has biological activity in the immune system. PEC-60-like immunoreactive material has been reported in catecholamine neurons of the central and peripheral nervous systems, but the peptide has not been identified from that material. We have now isolated PEC-60 from pig and rat brains with a method that combines column purification procedures with the specificity of a radioimmunoassay and the sensitivity of mass spectrometry to directly identify the peptide. The results show that PEC-60, like many other peptides, is expressed in the gastrointestinal tract and the central nervous system. The specific regional brain distribution and interaction with classical neurotransmitters raise the possibility that PEC-60 may play a role in the central nervous system disorders involving dopamine dysregulation.
authors.affiliation: Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Norberg
authors.forename: S
authors.initials: S
authors.lastname: Gruber
authors.forename: F
authors.initials: F
authors.lastname: Angelucci
authors.forename: S
authors.initials: S
authors.lastname: Renlund
authors.forename: H
authors.initials: H
authors.lastname: Wadensten
authors.forename: S
authors.initials: S
authors.lastname: Efendic
authors.forename: C G
authors.initials: CG
authors.lastname: Ostenson
authors.forename: H
authors.initials: H
authors.lastname: Jörnvall
authors.forename: R
authors.initials: R
authors.lastname: Sillard
authors.forename: A A
authors.initials: AA
authors.lastname: Mathé
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D002540:Cerebral Cortex / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D008401:Gas Chromatography-Mass Spectrometry; D009479:Neuropeptides / Q000737:chemistry / Q000302:isolation & purification*; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification*; D011863:Radioimmunoassay; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity; D013552:Swine; D014018:Tissue Distribution
chemical_list: D009479:Neuropeptides; C069343:PEC-60 polypeptide; D010455:Peptides