Abstract
The presence and distribution of P2Y (nucleotide) receptor subtypes in rat sensory neurons has been investigated. RT-PCR showed that P2Y1, P2Y2, P2Y4 and P2Y6 receptor mRNA is expressed in sensory ganglia [dorsal root ganglion (DRG), nodose ganglion (NG) and trigeminal ganglion (TG)]. The regional and cellular distribution of P2Y1 and P2Y4 receptor proteins in these ganglia was investigated using immunohistochemistry. P2Y1 polyclonal antibodies stained over 80% of the sensory neurons, particularly the small-diameter (neurofilament-negative) neurons. The P2Y4 receptor antibody stained more medium- and large- (neurofilament-positive) diameter neurons than small-diameter neurons. P2Y1 and P2Y4 receptor immunoreactivity (P2Y1-IR and P2Y4-IR) was often coexpressed with P2X3 receptor immunoreactivity (P2X3-IR) in subpopulations of neurons. Double immunohistochemistry showed that 73–84% of P2X3 receptor-positive neurons also stained for the P2Y1 receptor in DRG, TG and NG while only 25–35% also stained for the P2Y4 receptor. Subpopulations of P2Y1-IR neurons were coexpressed with NF200, CGRP and IB4; most P2Y4-IR neurons were coexpressed with NF200, while only a few neurons were coexpressed with CGRP (10–20%) or with IB4 (1–2%). The results suggest that P2Y as well as P2X receptor subtypes contribute to purinergic signalling in sensory ganglia.
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Ruan, H.Z., Burnstock, G. Localisation of P2Y1 and P2Y4 receptors in dorsal root, nodose and trigeminal ganglia of the rat. Histochem Cell Biol 120, 415–426 (2003). https://doi.org/10.1007/s00418-003-0579-3
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DOI: https://doi.org/10.1007/s00418-003-0579-3