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Exocrine pancreatic secretion of phospholipid, menaquinone-4, and caveolin-1 in vivo

Authors
Journal
Biochemical and Biophysical Research Communications
0006-291X
Publisher
Elsevier
Publication Date
Volume
319
Issue
3
Identifiers
DOI: 10.1016/j.bbrc.2004.05.086
Keywords
  • Exocrine
  • Pancreas
  • Secretion
  • Acinar Cell
  • Caveolin 1
  • Menaquinone-4
  • Zymogen Granules
  • Vitamin K
  • Cholecystokinin
  • Secretin
Disciplines
  • Biology

Abstract

Abstract The exocrine pancreas releases secretory products essential for nutrient assimilation. In addition to digestive enzymes, the release of lipoprotein-like particles containing the membrane trafficking protein caveolin-1 from isolated pancreatic explants has been reported. The present study examined: (1) if gastrointestinal hormones induce the apical secretion of phospholipid in vivo and (2) a potential association of caveolin-1 and the lipid-soluble vitamin K analog menaquinone-4 (MK-4) with these structures. Analysis of isolated acinar cells, purified zymogen granules, and pancreatic juice collected in vivo indicated the presence a caveolin-1 immunoreactive protein that was acutely released in response hormone stimulation. Chloroform-extracted fractions of pancreatic juice also contained high concentrations of MK-4 that was secreted in parallel to protein and phospholipid. The presence of caveolin-1 and MK-4 in the phospholipid fraction of pancreatic juice places these molecules in the secretory pathway of exocrine cells and suggests a physiological role in digestive enzyme synthesis and/or processing.

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