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The anoctamins: Structure and function.

Rainer Schreiber1, Jiraporn Ousingsawat1, Karl Kunzelmann1

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Cell Calcium
|April 20, 2024
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Summary
This summary is machine-generated.

Anions channels called anoctamins (ANO), particularly ANO1, regulate ion transport in glands and epithelia. Their roles in healthy and diseased kidneys, including polycystic kidney disease, are highlighted.

Keywords:
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Area of Science:

  • Cellular Biology
  • Physiology

Background:

  • Anoctamins (TMEM16 proteins) are Ca2+-activated phospholipid scramblases and ion channels.
  • Anoctamin 1 (ANO1) is a Ca2+-activated, anion-selective channel coexpressed with scramblase ANO6 and other anoctamins.
  • ANO1 plays roles in salivary and pancreatic glands, airways, and gut epithelia, often supporting CFTR function.

Purpose of the Study:

  • To review the diverse functions of anoctamins, focusing on ANO1.
  • To explore ANO1's roles in both healthy and pathological conditions, particularly in kidney function and disease.
  • To discuss the potential functions of other epithelial anoctamins.

Main Methods:

  • Literature review of anoctamin function.
  • Analysis of ANO1's role in various epithelial tissues (glands, airways, gut, kidney).
  • Discussion of ANO1 and ANO6 involvement in pathological conditions like polycystic kidney disease.

Main Results:

  • ANO1 functions as a Cl- channel in glands and supports CFTR in airways and gut.
  • In the kidneys, ANO1 is involved in acid secretion, protein reabsorption, and HCO3- excretion.
  • ANO1 and ANO6 are upregulated in polycystic kidney disease, potentially driving proliferation and cyst growth.

Conclusions:

  • Anoctamins, especially ANO1, have critical roles in epithelial ion transport and cellular processes.
  • ANO1's function varies significantly between healthy and pathological states, with implications for kidney diseases.
  • Further research is needed to fully elucidate the functions of other epithelial anoctamins.