Secretion of metalloendopeptidase 24.15 (EC 3.4.24.15)

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dc.contributor.authorFerro, E. S.
dc.contributor.authorTullai, J. W.
dc.contributor.authorGlucksman, M. J.
dc.contributor.authorRoberts, J. L.
dc.contributor.institutionMt Sinai Med Ctr
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:28:00Z
dc.date.available2014-05-20T15:28:00Z
dc.date.issued1999-10-01
dc.description.abstractThe metalloendopeptidase EP24.15 (EC3.4.24.15) is a neuropeptide-metabolizing enzyme present in neural and endocrine tissues, presumably functioning extracellularly, Because the majority of the EP24.15 activity is identified in the soluble fraction of cellular homogenates, suggesting that the enzyme is primarily an intracellular protein, we addressed the issue of how EP24.15 arrives in the extracellular environment, We utilized a model system of neuroendocrine secretion, the AtT20 cell, According to both enzymatic activity and immunologic assays, EP24.15 was synthesized in and released from AtT20 cells. Under basal conditions and after stimulation by corticotropin-releasing hormone or the calcium ionophore A23187, EP24.15 activity accumulated in the culture medium. This secretion was not attributable to cell damage, as judged by the absence of release of cytosolic enzyme markers and the ability to exclude trypan blue dye. Pulse-chase analysis and subcellular fractionation of AtT20 cell extracts suggested that the mechanism of EP24.15 secretion is not solely via classical secretory pathways, Additionally, drugs which disrupt the classical secretory pathway, such as Brefeldin A and nocodazole, blocked A23187-stimulated EP24.15 release yet had no effect on basal EP24.15 release, suggesting differences in the basal and stimulated pathways of secretion for EP24.15. In summary, EP24.15 appears to be secreted from AtT20 pituitary cells into the extracellular milieu, where the enzyme can participate in the physiologic metabolism of neuropeptides.en
dc.description.affiliationMt Sinai Med Ctr, Fishberg Res Ctr Neurobiol, New York, NY 10029 USA
dc.description.affiliationSão Paulo State Univ, Dept Histol & Embryol, São Paulo, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Dept Histol & Embryol, São Paulo, Brazil
dc.format.extent781-789
dc.identifierhttp://dx.doi.org/10.1089/104454999314926
dc.identifier.citationDna and Cell Biology. Larchmont: Mary Ann Liebert Inc. Publ, v. 18, n. 10, p. 781-789, 1999.
dc.identifier.doi10.1089/104454999314926
dc.identifier.fileWOS000083320700006.pdf
dc.identifier.issn1044-5498
dc.identifier.urihttp://hdl.handle.net/11449/37910
dc.identifier.wosWOS:000083320700006
dc.language.isoeng
dc.publisherMary Ann Liebert, Inc.
dc.relation.ispartofDna and Cell Biology
dc.relation.ispartofjcr2.634
dc.relation.ispartofsjr0,872
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleSecretion of metalloendopeptidase 24.15 (EC 3.4.24.15)en
dc.typeArtigo
dcterms.licensehttp://www.liebertpub.com/nv/resources-tools/self-archiving-policy/51/
dcterms.rightsHolderMary Ann Liebert Inc. Publ
unesp.author.orcid0000-0003-1651-9192[1]

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