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Cell and Tissue Research

, Volume 343, Issue 2, pp 263–287 | Cite as

Channels and transporters in salivary glands

  • Eleni RoussaEmail author
Review

Abstract

According to the two-stage hypothesis, primary saliva, a NaCl-rich plasma-like isotonic fluid is secreted by salivary acinar cells and its ionic composition becomes modified in the duct sytem. The ducts secrete K+ and HCO 3 - and reabsorb Na+ and Cl- without any water movement, thus establishing a hypotonic final saliva. Salivary secretion depends on the coordinated action of several channels and transporters localized in the apical and basolateral membrane of acinar and duct cells. Early functional studies in perfused glands, followed by the molecular cloning of several transport proteins and the subsequent analysis of mutant mice, have greatly contributed to our understanding of salivary fluid and the electrolyte secretion process. With a few exceptions, most of the key channels and transporters involved in salivary secretion have now been identified and characterized. However, the picture that has emerged from all these studies is one of a complex molecular network characterized by redundancy for several transport proteins, compensatory mechanisms, and adaptive changes in health and disease. Current research is directed to the molecular interactions between the determinants and the ways in which they are regulated by extracellular signals and intracellular mediators. This review focuses on the functionally and molecularly best-characterized channels and transporters that are considered to be involved in transepithelial fluid and electrolyte transport in salivary glands.

Keywords

Salivary gland Submandibular Parotid Acid-base transport Chloride transport Potassium transport Mammals 

Notes

Acknowledgements

The author acknowledges the valuable contributions made by past and present collaborators and by members of her laboratory. She thanks Cornelius Schlosshardt for Figs. 1 and 2.

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© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Anatomy and Cell Biology II, Department of Molecular EmbryologyAlbert Ludwigs University FreiburgFreiburg i. Br.Germany

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