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Neutrophil elastase sorting involves plasma membrane trafficking requiring the C-terminal propeptide.

Författare

Summary, in English

The primary granules/secretory lysosomes of neutrophils store mature neutrophil elastase (NE) as a luminal protein after proteolytic removal of N-terminal and C-terminal pro-peptides from a proform of NE. The N-terminal pro-peptide prevents premature activation that might be toxic to the cell, but the C-terminal pro-peptide has no defined function. In this study, we investigated the role of the C-terminal pro-peptide in trafficking of NE by expressing, in rat basophilic leukemia (RBL) cells, both wild-type NE and the mutant NE/Delta 248-267, which lacks the C-terminal pro-peptide. Both transfected proteins were found to be targeted to secretory lysosomes. in addition, results from antibody ligation and cell-surface biotinylation indicated that proform of NE was targeted to the plasma membrane, and then subjected to endocytosis. The results were supported by the detection of targeting of the proform to the plasma membrane followed by internalization both in RBL cells and normal granulopoietic precursor cells. Targeting of NE to the plasma membrane required the C-terminal pro-peptide as NE/ Delta 248-267 expressed in RBL cells bypassed plasma membrane trafficking. our results indicate targeting of a population of NE to the plasma membrane and internalization dependent on the C-terminal NE pro-peptide. (c) 2006 Elsevier Inc. All rights reserved.

Publiceringsår

2006

Språk

Engelska

Sidor

3471-3484

Publikation/Tidskrift/Serie

Experimental Cell Research

Volym

312

Issue

18

Dokumenttyp

Artikel i tidskrift

Förlag

Academic Press

Ämne

  • Hematology
  • Infectious Medicine

Nyckelord

  • neutrophil elastase
  • sorting
  • pro-peptide
  • secretory lysosome
  • membrane
  • trafficking

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1090-2422