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Sodium channel NaV1.3 is important for enterochromaffin cell excitability and serotonin release.

Abstract：

:In the gastrointestinal (GI) epithelium, enterochromaffin (EC) cells are enteroendocrine cells responsible for producing >90% of the body's serotonin (5-hydroxytryptamine, 5-HT). However, the molecular mechanisms of EC cell function are poorly understood. Here, we found that EC cells in mouse primary cultures fired spontaneous bursts of action potentials. We examined the repertoire of voltage-gated sodium channels (NaV) in fluorescence-sorted mouse EC cells and found that Scn3a was highly expressed. Scn3a-encoded NaV1.3 was specifically and densely expressed at the basal side of both human and mouse EC cells. Using electrophysiology, we found that EC cells expressed robust NaV1.3 currents, as determined by their biophysical and pharmacologic properties. NaV1.3 was not only critical for generating action potentials in EC cells, but it was also important for regulating 5-HT release by these cells. Therefore, EC cells use Scn3a-encoded voltage-gated sodium channel NaV1.3 for electrical excitability and 5-HT release. NaV1.3-dependent electrical excitability and its contribution to 5-HT release is a novel mechanism of EC cell function.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Strege PR,Knutson K,Eggers SJ,Li JH,Wang F,Linden D,Szurszewski JH,Milescu L,Leiter AB,Farrugia G,Beyder A

doi

10.1038/s41598-017-15834-3

subject

Has Abstract

pub_date

2017-11-15 00:00:00

pages

15650

issue

1

issn

2045-2322

pii

10.1038/s41598-017-15834-3

journal_volume

7

pub_type

杂志文章

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