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Epithelial sodium channel (ENaC) in GtoPdb v.2021.2

2021, IUPHAR/BPS Guide to Pharmacology CITE

The epithelial sodium channels (ENaC) are located on the apical membrane of epithelial cells in the kidney tubules, lung, respiratory tract, male and female reproductive tracts, sweat and salivary glands, placenta, colon, and some other organs [9, 13, 22, 21, 42]. In these epithelia, Na+ ions flow from the extracellular fluid into the cytoplasm of epithelial cells via ENaC. The Na+ ions are then pumped out of the cytoplasm into the interstitial fluid by the Na+/K+ ATPase located on the basolateral membrane [36]. As Na+ is one of the major electrolytes in the extracellular fluid (ECF), osmolarity change initiated by the Na+ flow is accompanied by a flow of water accompanying Na+ ions [6]. Thus, ENaC has a central role in regulating ECF volume and blood pressure, primarily via its function in the kidney [37]. The expression of ENaC subunits, hence its activity, is regulated by the renin-angiotensin-aldosterone system, and other factors involved in electrolyte homeostasis [37, 30]. In ...

IUPHAR/BPS Guide to Pharmacology CITE https://doi.org/10.2218/gtopdb/F122/2021.2 Epithelial sodium channel (ENaC) in GtoPdb v.2021.2 Israel Hanukoglu1 1. Ariel University, Israel Abstract The epithelial sodium channels (ENaC) are located on the apical membrane of epithelial cells in the kidney tubules, lung, respiratory tract, male and female reproductive tracts, sweat and salivary glands, placenta, colon, and some other organs [9, 13, 22, 21, 42]. In these epithelia, Na+ ions flow from the extracellular fluid into the cytoplasm of epithelial cells via ENaC. The Na+ ions are then pumped out of the cytoplasm into the interstitial fluid by the Na+/K+ ATPase located on the basolateral membrane [36]. As Na+ is one of the major electrolytes in the extracellular fluid (ECF), osmolarity change initiated by the Na+ flow is accompanied by a flow of water accompanying Na+ ions [6]. Thus, ENaC has a central role in regulating ECF volume and blood pressure, primarily via its function in the kidney [37]. The expression of ENaC subunits, hence its activity, is regulated by the renin-angiotensin-aldosterone system, and other factors involved in electrolyte homeostasis [37, 30]. In the respiratory tract and female reproductive tract, large segments of the epithelia are composed of multi-ciliated cells. In these cells, ENaC is located along the entire length of the cilia that cover the cell surface [15]. Cilial location greatly increases ENaC density per cell surface and allows ENaC to serve as a sensitive regulator of osmolarity of the periciliary fluid throughout the whole depth of the fluid bathing the cilia [15]. In contrast to ENaC, CFTR (ion transporter defective in cystic fibrosis) is located on non-cilial cell-surface [15]. In the vas deferens segment of the male reproductive tract, the luminal surface is covered by microvilli and stereocilia projections with backbones composed of actin filament bundles [42]. In these cells, both ENaC and the water channel aquaporin AQP9 are localized on these projections and also in the basal and smooth muscle layers [42]. Thus, ENaC function is also essential for the clearance of respiratory airways, transport of germ cells, fertilization, implantation, and cell migration [15, 22]. Contents This is a citation summary for Epithelial sodium channel (ENaC) in the Guide to Pharmacology database (GtoPdb). It exists purely as an adjunct to the database to facilitate the recognition of citations to and from the database by citation analyzers. Readers will almost certainly want to visit the relevant sections of the database which are given here under database links. GtoPdb is an expert-driven guide to pharmacological targets and the substances that act on them. GtoPdb is a reference work which is most usefully represented as an on-line database. As in any publication this work should be appropriately cited, and the papers it cites should also be recognized. This document provides a citation for the relevant parts of the database, and also provides a reference list for the research cited by those parts. For further details see [7]. Please note that the database version for the citations given in GtoPdb are to the most recent preceding version in which the family or its subfamilies and targets were substantially changed. The links below are to the current version. If you need to consult the cited version, rather than the most recent version, please contact the GtoPdb curators. Database links Epithelial sodium channel (ENaC) https://www.guidetopharmacology.org/GRAC/FamilyDisplayForward?familyId=122 Introduction to Epithelial sodium channel (ENaC) https://www.guidetopharmacology.org/GRAC/FamilyIntroductionForward?familyId=122 Channels and Subunits Complexes ENaCαβγ https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=742 Subunits ENaC α https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=738 ENaC β https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=739 ENaC γ https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=741 ENaC δ https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=740 References 1. Anand P, Puranik A, Aravamudan M, Venkatakrishnan AJ and Soundararajan V. (2020) SARSCoV-2 strategically mimics proteolytic activation of human ENaC. Elife 9 [PMID:32452762] 2. Baconguis I, Bohlen CJ, Goehring A, Julius D and Gouaux E. (2014) X-ray structure of acidsensing ion channel 1-snake toxin complex reveals open state of a Na(+)-selective channel. Cell 156: 717-29 [PMID:24507937] 3. Bize V and Horisberger JD. (2007) Sodium self-inhibition of human epithelial sodium channel: selectivity and affinity of the extracellular sodium sensing site. Am J Physiol Renal Physiol 293: F1137-46 [PMID:17670907] 4. Bogdanović R, Kuburović V, Stajić N, Mughal SS, Hilger A, Ninić S, Prijić S and Ludwig M. (2012) Liddle syndrome in a Serbian family and literature review of underlying mutations. Eur J Pediatr 171: 471-8 [PMID:21956615] 5. Boggula VR, Hanukoglu I, Sagiv R, Enuka Y and Hanukoglu A. (2018) Expression of the epithelial sodium channel (ENaC) in the endometrium - Implications for fertility in a patient with pseudohypoaldosteronism. J Steroid Biochem Mol Biol 183: 137-141 [PMID:29885352] 6. Bourque CW. (2008) Central mechanisms of osmosensation and systemic osmoregulation. Nat Rev Neurosci 9: 519-31 [PMID:18509340] 7. 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