Nakazawa K, Inoue K, Inoue K
Division of Pharmacology, National Institute of Health Sciences, Tokyo, Japan.
Pflugers Arch. 1994 Nov;429(1):143-5. doi: 10.1007/BF02584042.
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 microM) reduced the K+ current. Among adenosine derivatives, ADP (100 microM) slightly inhibited the K+ current, and AMP or adenosine (100 microM) was ineffective. UTP was as potent as ATP and alpha,beta-methylene ATP was less effective than ATP. The inhibition by ATP of the K+ current was abolished by inclusion of 2 mM GDP beta S 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.
