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Journal of Neuroscience, Vol 16, 2495-2507, Copyright © 1996 by Society for Neuroscience
Cloning OF P2X5 and P2X6 receptors and the distribution and properties of an extended family of ATP-gated ion channels
G Collo, RA North, E Kawashima, E Merlo-Pich, S Neidhart, A Surprenant and G Buell
Glaxo Institute for Molecular Biology, Geneva, Switzerland.
Two new P2X receptor cDNAs (P2X5 and P2X6) were isolated and expressed. All
six proteins are 36-48 percent identical and seem to have two transmembrane
segments with a large extracellular loop. Functionally, P2X5 and P2X6
receptors most resemble P2X2 and P2X4; they desensitize only slowly and do
not respond to alpha beta methylene-ATP. P2X6 receptors, like P2X4,
receptors, are not blocked by the antagonists suramin and
pyridoxal-5-phosphate-6-azophenyl-2',4'-disulfonic acid. P2X6 and P2X5
receptors express at lower levels than P2X1-P2X4 receptors do, perhaps
indicating that they do not normally form homomultimeric channels. P2X6 and
P2X4 are the receptors expressed most heavily in brain, where their RNAs
have a widespread and extensively overlapping distribution. The spinal cord
expresses all receptors except P2X3. P2X2, P2X4, and P2X6, are the most
abundant in the dorsal horn. Sensory neurons of the trigeminal, dorsal
root, and nodose ganglia express all six RNAs; P2X3 is found only there.
The functional properties and tissue distribution of these six P2X
receptors indicate new roles for ATP-gated ion channels.
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