ATP reduces voltage-activated K+ current in cultured rat hippocampal neurons

Ken Nakazawa, Kaori Inoue, Kazuhide Inoue

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20 Citations (Scopus)


Effects of extracellular ATP were investigated in cultured rat hippocampal neurons using whole-cell voltage-clamp techniques. When a depolarizing step to +10 mV was applied from a holding potential of -60 mV, an outward K+ current was activated. ATP (3 to 300 μM) reduced the K+ current. Among adenosine derivatives, ADP (100 μM) slightly inhibited the K+ current, and AMP or adenosine (100 μM) was ineffective. UTP was as potent as ATP and α,β-methylene ATP was less effective than ATP. The inhibition by ATP of the K+ current was abolished by inclusion of 2 mM GDPβS in the intracellular solution. The results indicate that ATP inhibits K+ channels in rat hippocampal neurons through UTP-responsive P2-purinoceptors coupled with GTP-binding proteins.

Original languageEnglish
Pages (from-to)143-145
Number of pages3
JournalPflügers Archiv: European Journal of Physiology
Issue number1
Publication statusPublished - Nov 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Biochemistry
  • Physiology (medical)


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