Ischemic poison lysophosphatidylcholine modifies heart sodium channels gating inducing long-lasting bursts of openings

N. A. Burnashev, A. I. Undrovinas, I. A. Fleidervish, L. V. Rosenshtraukh

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The effects of lysophosphatidylcholine (LPC) on Na channels in inside-out patches of adult rat ventricular cells using the patch-clamp technique have been investigated. Application of LPC (9-25 μM) from the inner side of membrane for 4-15 min caused a reduction of averaged Na current (INa) peak and prolonged the time course of inactivation in the potential range of -50 to -10 mV. Analysis of single channel behaviour revealed that after 30-50 min of exposure, in addition to normally functioning Na channels with short openings, LPC induced longlasting bursts of Na channel openings (up to the 300 ms duration of the test pulses). This resulted in an appearance of noninactivated component of INa. The slope conductance of these modified channels remained the same as in control (11.3 pS - control; 11.6 pS - LPC-treated). The dwell time for modified channels increased significantly.

Original languageEnglish
Pages (from-to)124-126
Number of pages3
JournalPflugers Archiv European Journal of Physiology
Volume415
Issue number1
DOIs
StatePublished - 1 Oct 1989
Externally publishedYes

Keywords

  • Sodium channels
  • heart cells
  • lysophosphatidylcholine

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Physiology (medical)

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