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Sorting and secretory pathways in exocrine cells.

J D Castle1

  • 1Department of Anatomy and Cell Biology, University of Virginia Health Sciences Center, Charlottesville 22908.

American Journal of Respiratory Cell and Molecular Biology
|February 1, 1990
PubMed
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Exocrine cells use major and minor pathways for protein secretion. The minor pathway, distinct from storage granules, releases proteins via vesicles, suggesting complex sorting mechanisms in acinar cells.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Exocrine secretory cells utilize multiple pathways for protein secretion beyond the Golgi apparatus.
  • The primary route involves sorting proteins into storage granules for regulated exocytosis.
  • A secondary, vesicular pathway originates from maturing granules, secreting proteins differently.

Purpose of the Study:

  • To investigate the distinct protein sorting mechanisms in exocrine secretory cells.
  • To understand the role and composition of the nongranular secretory pathway.
  • To explore the characteristics of secretory granule membranes and their protein content.

Main Methods:

  • Analysis of protein sorting and secretion in pancreatic and parotid acinar cells.
  • Characterization of the nongranular (vesicular) secretory pathway.

Related Experiment Videos

  • Investigation of secretory granule membrane composition and dynamics.

    • Main Results:

    • Identified a major granular and a minor nongranular vesicular pathway for protein secretion.
    • Demonstrated that the nongranular pathway carries similar polypeptides but in different proportions compared to granular storage.
    • Highlighted that protein sorting involves selective aggregation and exclusion, not just deposition.

    Conclusions:

    • Protein secretion in exocrine cells is regulated by complex sorting mechanisms involving both granular and nongranular pathways.
    • Secretory granules represent a specialized compartment with unique membrane properties.
    • Further research is needed to elucidate the functional roles of these pathways and granule membrane proteins.