Citation: Pin YANG, Yan Fang SHANG, Zhen Ming PEI. Action Mechanism Research of Lanthanons to Slow Vacuolar Ion Channels in Raphanus Satirus L. (Xinlimei) Radish by Patch-Clamp[J]. Chinese Chemical Letters, ;2001, 12(9): 813-814. shu

Action Mechanism Research of Lanthanons to Slow Vacuolar Ion Channels in Raphanus Satirus L. (Xinlimei) Radish by Patch-Clamp

1.
Institute of Molecular Science, Shanxi University, Taiyuan 030006;
2.
Department of Biology, Duke University, Durham, NC 27708

Received Date: 15 January 2001

Fund Project: The authors acknowledge the support of the National Natural Science Foundation of China and Provincial Natural Science Foundation of Shanxi.

We used whole-vacuolar patch-clamp recording mode to study the action mechanism of La³⁺ to Slow Vacuolar (SV) channels for the first time. We recorded SV channel currents of Xinlimei (Raphanus satirus L.) vacuolars. The minimum activation potentials of voltage-dependent SV channels lied in 25±5 mV. The increase in cytoplasmic Ca²⁺ led toenhancement of SV-type currents. It was found that the threshold potential of activation shifted towards more depolarized values whenever cytoplasmic Ca²⁺ was increased. When 10^-10 mol/Lfree La³⁺ was added to the bath, SV-type current was suppressed by 60~75%. These data showed La³⁺ reduced ion permeabilities of Xinlimei root vacuolar membrane.
- Whole-vacuolar recording,
- SV-type current,
- cytoplasmic Ca²⁺,
- La³⁺,
- Patch-Clamp
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