Linked Life Data

18057001

Source:http://linkedlifedata.com/resource/pubmed/id/18057001

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2008-2-11
pubmed:abstractText
Prohormones often undergo extensive cellular processing prior to secretion. These post-translational processing events occur in organelles of the constitutive or regulated secretory pathway. The aim of this study was to examine the relationship between post-translational modifications and the secretory pathways taken by peptides derived from progastrin, the prohormone of gastrin, which in vivo is secreted by cells of the pyloric glands and stimulates the release of gastric acid. Targeting progastrin to compartments of the early secretory pathway shows that endoproteolytic processing is initiated in a pre-trans-Golgi network compartment of endocrine but not non-endocrine cells. The resulting N-terminal fragments of progastrin are secreted via the constitutive pathway, whereas endoproteolytically processed C-terminal fragments are secreted via the regulated or constitutive-like pathways. C-terminal fragments derived from progastrin differ in characteristic manners in levels and patterns of carboxyamidation and tyrosine sulfation in accordance with the secretory pathway taken. Point mutations introduced into a sorting motif disrupt these patterns, suggesting that differences in post-translational modifications are attributable to differential intracellular sorting of precursors. The results suggest a two-step sorting mechanism for progastrin leading to differential secretion of processed fragments via different secretory pathways.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
283
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4014-21
pubmed:dateRevised
2008-6-26
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Distinct linkage between post-translational processing and differential secretion of progastrin derivatives in endocrine cells.
pubmed:affiliation
Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, KB 3014, Copenhagen University Hospital, Blegdamsvej 9, Copenhagen DK-2100, Denmark. jrb@rh.dk
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't