Pannexin 1 in erythrocytes: Function without a gap

Silviu Locovei, Li Bao, Gerhard Dahl

Research output: Contribution to journalArticle

378 Scopus citations

Abstract

ATP is a widely used extracellular signaling molecule. The mechanism of ATP release from cells is presently unresolved and may be either vesicular or channel-mediated. Erythrocytes release ATP in response to low oxygen or to shear stress. In the absence of vesicles, the release has to be through channels. Erythrocytes do not form gap junctions. Yet, here we show with immunohistochemical and electrophysiological data that erythrocytes express the gap junction protein pannexin 1. This protein, in addition to forming gap junction channels in paired oocytes, can also form a mechanosensitive and ATP-permeable channel in the nonjunctional plasma membrane. Consistent with a role of pannexin 1 as an ATP release channel, ATP release by erythrocytes was attenuated by the gap junction blocker carbenoxolone. Furthermore, under conditions of ATP release, erythrocytes took up fluorescent tracer molecules permeant to gap junction channels.

Original languageEnglish (US)
Pages (from-to)7655-7659
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number20
DOIs
StatePublished - May 16 2006

Keywords

  • ATP release
  • Dye uptake
  • Gap junction
  • Hemichannel

ASJC Scopus subject areas

  • Genetics
  • General

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