title: Secretion of a neuropeptide-metabolizing enzyme similar to endopeptidase 22.19 by glioma C6 cells.
abstract: An endopeptidase capable of metabolizing a number of neuropeptides and generating [Met5] and [Leu5] enkephalin from enkephalin-containing peptides is secreted by glioma C6 cells. This neutral endopeptidase that is likely to be a thiol protease, has a Mr of 71KDa and is effective only towards oligopeptides. Its specificity towards neuropeptides is identical to that of soluble endopeptidase 22.19. Moreover, when a partially purified preparation of enkephalin-generating enzyme secreted by glioma C6 cells was submitted to immunoblotting, an antiserum against purified brain endopeptidase 22.19 recognized a single band at Mr of 71 KDa. These data suggest that the soluble endopeptidase 22.19 may be secreted by glioma C6 cells thus allowing its participation in the biotransformation of opioid peptides in the CNS.
authors.affiliation: Department of Pharmacology and Immunology, University of São Paulo, Brazil.
authors.forename: E S
authors.initials: ES
authors.lastname: Ferro
authors.forename: D V
authors.initials: DV
authors.lastname: Tambourgi
authors.forename: F
authors.initials: F
authors.lastname: Gobersztejn
authors.forename: M D
authors.initials: MD
authors.lastname: Gomes
authors.forename: M
authors.initials: M
authors.lastname: Sucupira
authors.forename: M C
authors.initials: MC
authors.lastname: Armelin
authors.forename: T L
authors.initials: TL
authors.lastname: Kipnis
authors.forename: A C
authors.initials: AC
authors.lastname: Camargo
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004743:Enkephalin, Leucine / Q000378:metabolism; D004744:Enkephalin, Methionine / Q000378:metabolism; D005910:Glioma / Q000201:enzymology*; D007700:Kinetics; D008666:Metalloendopeptidases / Q000378:metabolism*; D008969:Molecular Sequence Data; D009479:Neuropeptides / Q000378:metabolism*; D051381:Rats; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D014407:Tumor Cells, Cultured
chemical_list: D009479:Neuropeptides; D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine; D008666:Metalloendopeptidases; C022510:thimet oligopeptidase