Pannexins and gap junction protein diversity

V. I. Shestopalov, Y. Panchin

Research output: Contribution to journalReview articlepeer-review

138 Scopus citations


Gap junctions (GJs) are composed of proteins that form a channel connecting the cytoplasm of adjacent cells. Connexins were initially considered to be the only proteins capable of GJ formation. Another family of GJ proteins (innexins) were first found in invertebrates and were proposed to be renamed pannexins after their orthologs were discovered in vertebrates. The lack of both connexins and pannexins in the genomes of some metazoans suggests that other, still undiscovered GJ proteins exist. In vertebrates, connexins and pannexins co-exist. Here we discuss whether vertebrate pannexins have a nonredundant role in animal physiology. Pannexin channels appear to be suited for ATP and calcium signaling and play a role in the maintenance of calcium homeostasis by mechanisms implicating both GJ and nonjunctional function. Suggested roles in the ischemic death of neurons, schizophrenia, inflammation and tumor suppression have drawn much attention to exploring the molecular properties and cellular functions of pannexins.

Original languageEnglish (US)
Pages (from-to)376-394
Number of pages19
JournalCellular and Molecular Life Sciences
Issue number3
StatePublished - Feb 2008


  • Calcium wave
  • Cell-cell communication
  • Connexin
  • Gap junctions
  • Hemichannel
  • Innexin
  • Pannexin

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Cell Biology


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