Modulation of metabolic communication through gap junction channels by transjunctional voltage; Synergistic and antagonistic effects of gating and ionophoresis

Nicolás Palacios-Prado, Feliksas F. Bukauskas

Research output: Contribution to journalReview article

29 Scopus citations

Abstract

Gap junction (GJ) channels assembled from connexin (Cx) proteins provide a structural basis for direct electrical and metabolic cell-cell communication. Here, we focus on gating and permeability properties of Cx43/Cx45 heterotypic GJs exhibiting asymmetries of both voltage-gating and transjunctional flux (Jj) of fluorescent dyes depending on transjunctional voltage (V j). Relatively small differences in the resting potential of communicating cells can substantially reduce or enhance this flux at relative negativity or positivity on Cx45 side, respectively. Similarly, series of V j pulses resembling bursts of action potentials (APs) reduce J j when APs initiate in the cell expressing Cx43 and increase J j when APs initiate in the cell expressing Cx45. Jj of charged fluorescent dyes is affected by ionophoresis and Vj-gating and the asymmetry of Jj-Vj dependence in heterotypic GJs is enhanced or reduced when ionophoresis and Vj-gating work in a synergistic or antagonistic manner, respectively. Modulation of cell-to-cell transfer of metabolites and signaling molecules by Vj may occur in excitable as well as non-excitable tissues and may be more expressed in the border between normal and pathological regions where intercellular gradients of membrane potential and concentration of ions are substantially altered. This article is part of a Special Issue entitled: The Communicating junctions, composition, structure and characteristics.

Original languageEnglish (US)
Pages (from-to)1884-1894
Number of pages11
JournalBiochimica et Biophysica Acta - Biomembranes
Volume1818
Issue number8
DOIs
StatePublished - Aug 1 2012

Keywords

  • Connexin
  • Dye transfer
  • Heterotypic channel
  • Signaling asymmetry
  • Transjunctional permeability and flux
  • Voltage gating

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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