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. 1988 Apr;93(4):811–816. doi: 10.1111/j.1476-5381.1988.tb11466.x

Single ionic channels induced by palytoxin in guinea-pig ventricular myocytes.

I Muramatsu 1, M Nishio 1, S Kigoshi 1, D Uemura 1
PMCID: PMC1853899  PMID: 2455579

Abstract

1. Mechanisms of palytoxin-induced ion permeability were examined in isolated single ventricular cells of guinea-pig under whole-cell-attached patch clamp conditions. 2. Palytoxin (1-2 x 10(-11) M, dissolved in Tyrode solution and put in the patch electrode) induced an elementary current flowing through single channels. Direction of the current was inward and the amplitude was 0.65 +/- 0.03 pA (mean +/- s.e. mean) at the resting membrane potential. The amplitude increased linearly with membrane hyperpolarization and decreased with depolarization; the single channel conductance was 9.5 +/- 0.5 pS. 3. Palytoxin-induced single channel current was resistant to tetrodotoxin (5 x 10(-5) M) or cobalt ions (2 x 10(-3) M) and was observed under Ca-free conditions. However, no channel current was induced by palytoxin (10(-11) - 10(-9) M) dissolved in Na+-free, choline-Tyrode solution. 4. Palytoxin also induced single channel currents in Na+-free, NH4+-, Li+- or Cs+-Tyrode solution, and the slope conductances were 16.5 +/- 1.6 pS, 9.2 +/- 0.7 pS and 11.0 +/- 0.7 pS, respectively. 5. These results indicate that palytoxin forms a new type of ionic channel with unique ion selectivity and gating behaviour.

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Selected References

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