Exocrine pancreatic secretion of phospholipid, menaquinone-4, and caveolin-1 in vivo |
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Authors: | Thomas Diana D H Krzykowski Karen J Engelke Jean A Groblewski Guy E |
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Institution: | Department of Nutritional Sciences, University of Wisconsin, Madison, WI 53706, USA. |
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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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Keywords: | Exocrine Pancreas Secretion Acinar cell Caveolin 1 Menaquinone-4 Zymogen granules Vitamin K Cholecystokinin Secretin |
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