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Nature 1994 Feb 03;3676462:463-7. doi: 10.1038/367463a0.
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Amiloride-sensitive epithelial Na+ channel is made of three homologous subunits.

Canessa CM , Schild L , Buell G , Thorens B , Gautschi I , Horisberger JD , Rossier BC .

The amiloride-sensitive epithelial sodium channel constitutes the rate-limiting step for sodium reabsorption in epithelial cells that line the distal part of the renal tubule, the distal colon, the duct of several exocrine glands, and the lung. The activity of this channel is upregulated by vasopressin and aldosterone, hormones involved in the maintenance of sodium balance, blood volume and blood pressure. We have identified the primary structure of the alpha-subunit of the rat epithelial sodium channel by expression cloning in Xenopus laevis oocytes. An identical subunit has recently been reported. Here we identify two other subunits (beta and gamma) by functional complementation of the alpha-subunit of the rat epithelial Na+ channel. The ion-selective permeability, the gating properties and the pharmacological profile of the channel formed by coexpressing the three subunits in oocytes are similar to that of the native channel.

PubMed ID: 8107805
Article link: Nature

Species referenced: Xenopus laevis
Genes referenced: avp

References :
Jentsch, Trinity of cation channels. 1994, Pubmed