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Subcellular localization of epidermal growth factor in human parotid gland

M S Lantini1, M Piludu, M Cossu

  • 1Dipartimento di Citomorfologia, Università di Cagliari, Cittadella Universitaria, Monserrato, Italy.

The Histochemical Journal
|February 23, 2002
PubMed

Insights

Human parotid glands secrete epidermal growth factor (EGF) via both acinar cell exocytosis and ductal cell vesicle release. This suggests EGF may enter saliva and the surrounding tissue from parotid ducts.

Area of Science:

  • Cell Biology
  • Histology
  • Endocrinology

Background:

  • Epidermal growth factor (EGF) plays crucial roles in cell growth and tissue repair.
  • The specific localization and secretion pathways of EGF within the human parotid gland are not fully understood.

Purpose of the Study:

  • To investigate the intracellular distribution and potential secretion routes of epidermal growth factor (EGF) in the human parotid gland.

Main Methods:

  • Immunogold cytochemistry at the electron microscopy level was employed.
  • Human parotid gland tissue was analyzed for EGF immunoreactivity.

Main Results:

  • EGF immunoreactivity was detected in both acinar and ductal cells of the human parotid gland.
  • Acinar cells showed EGF in secretory granules, suggesting secretion via exocytosis.
  • Ductal cells, especially in striated ducts, displayed EGF in cytoplasmic vesicles near apical and basal plasma membranes.

Conclusions:

  • The human parotid gland contributes to salivary EGF through acinar cell exocytosis.
  • Ductal cells may release EGF both into saliva (apically) and the interstitium (basally).
  • This dual release mechanism highlights a potential paracrine or endocrine role for parotid EGF.

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