Localisation of P2Y1 and P2Y4 receptors in dorsal root, nodose and trigeminal ganglia of the rat.
The presence and distribution of P2Y (nucleotide) receptor subtypes in rat sensory neurons has been investigated. RT-PCR showed that P2Y(1), P2Y(2), P2Y(4) and P2Y(6) receptor mRNA is expressed in sensory ganglia [dorsal root ganglion (DRG), nodose ganglion (NG) and trigeminal ganglion (TG)]. The regional and cellular distribution of P2Y(1) and P2Y(4) receptor proteins in these ganglia was investigated using immunohistochemistry. P2Y(1) polyclonal antibodies stained over 80% of the sensory neurons, particularly the small-diameter (neurofilament-negative) neurons. The P2Y(4) receptor antibody stained more medium- and large- (neurofilament-positive) diameter neurons than small-diameter neurons. P2Y(1) and P2Y(4) receptor immunoreactivity (P2Y(1)-IR and P2Y(4)-IR) was often coexpressed with P2X(3) receptor immunoreactivity (P2X(3)-IR) in subpopulations of neurons. Double immunohistochemistry showed that 73-84% of P2X(3) receptor-positive neurons also stained for the P2Y(1) receptor in DRG, TG and NG while only 25-35% also stained for the P2Y(4) receptor. Subpopulations of P2Y(1)-IR neurons were coexpressed with NF200, CGRP and IB(4); most P2Y(4)-IR neurons were coexpressed with NF200, while only a few neurons were coexpressed with CGRP (10-20%) or with IB(4) (1-2%). The results suggest that P2Y as well as P2X receptor subtypes contribute to purinergic signalling in sensory ganglia.
Ruan
Huai Zhen
HZ
Autonomic Neuroscience Institute, Royal Free and University College Medical School, Rowland Hill Street, NW3 2PF, London, UK.
Burnstock
Geoffrey
G
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D015740:Calcitonin Gene-Related Peptide / Q000032:analysis; D005727:Ganglia, Spinal / Q000737:chemistry / Q000502:physiology*; D015870:Gene Expression; D037102:Lectins; D016900:Neurofilament Proteins / Q000032:analysis; D009620:Nodose Ganglion / Q000737:chemistry / Q000502:physiology*; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D018048:Receptors, Purinergic P2 / Q000032:analysis / Q000235:genetics*; D058477:Receptors, Purinergic P2X3; D058472:Receptors, Purinergic P2Y1; D012668:Trigeminal Ganglion / Q000737:chemistry / Q000502:physiology*
D037102:Lectins; D016900:Neurofilament Proteins; C546410:P2rx3 protein, rat; C546384:P2ry1 protein, rat; D012333:RNA, Messenger; D018048:Receptors, Purinergic P2; D058477:Receptors, Purinergic P2X3; D058472:Receptors, Purinergic P2Y1; C104749:purinoceptor P2Y4; C051774:neurofilament protein H; D000255:Adenosine Triphosphate; D015740:Calcitonin Gene-Related Peptide