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Chloride channels and salivary gland function.

J E Melvin1

  • 1Center for Oral Biology, Rochester Institute for Biomedical Sciences, University of Rochester Medical Center, New York 14642, USA.

Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists
|April 12, 2000
PubMed
Summary

Salivary gland fluid secretion relies on chloride (Cl-) channel activity. Different Cl- channels, activated by calcium or cAMP, control fluid movement and salt reabsorption in salivary cells.

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Area of Science:

  • Physiology
  • Molecular Biology
  • Cell Biology

Background:

  • Transepithelial chloride (Cl-) movement is crucial for fluid and electrolyte transport in salivary glands.
  • Salivary gland function, including fluid secretion and salt reabsorption, is modulated by sympathetic and parasympathetic stimulation.
  • Multiple classes of Cl- channels with distinct gating mechanisms exist in salivary cells.

Purpose of the Study:

  • To review the properties of various Cl- currents in salivary gland cells.
  • To propose functional roles for different Cl- channels based on their unique characteristics.
  • To elucidate the mechanisms of fluid and electrolyte transport in saliva formation.

Main Methods:

  • Literature review of identified Cl- channels in salivary gland cells.

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  • Analysis of distinct gating mechanisms, including Ca2+ and cAMP activation.
  • Examination of Cl- channel roles in acinar cell secretion and ductal cell reabsorption.

    • Main Results:

    • Five classes of Cl- channels with unique gating properties have been identified in salivary cells.
    • Calcium (Ca2+)-gated Cl- channels are dominant in acinar cell fluid secretion.
    • cAMP-gated Cl- channels are important for NaCl reabsorption in ductal cells.
    • Other Cl- channels activated by membrane potential and cell volume changes modulate fluid transport.

    Conclusions:

    • Diverse Cl- channels play critical roles in regulating salivary fluid and electrolyte composition.
    • Understanding these channels is key to comprehending saliva formation and function.
    • Further research into the specific functions of each Cl- channel class is warranted.