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P2X2 and P2X3 purinoceptors in the rat enteric nervous system

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Abstract

Adenosine 5′-triphosphate receptors are known to be involved in fast excitatory postsynaptic currents in myenteric neurons of the digestive tract. In the present study, the distribution of P2X2 and P2X3 receptor mRNA was examined by in situ hybridisation while P2X2 and P2X3 receptor protein was localised by immunohistochemical methods. In addition, P2X2 and P2X3 receptors were colocalised with calbindin and calretinin in the myenteric and submucosal plexus. P2X2- and P2X3-immunoreactive neurons were found in the myenteric and submucosal plexuses throughout the entire length of the rat digestive tract from the stomach to the colon. Approximately 60%, 70% and 50% of the ganglion cells in the myenteric plexus of the gastric corpus, ileum and distal colon, and 56% and 45% in the submucosal plexus of the ileum and distal colon, respectively, showed positive immunoreactivity to the P2X2 receptor. Approximately 10%, 2% and 15% of the ganglion cells in the myenteric plexus of the gastric corpus, ileum and distal colon, and 62% and 40% in the submucosal plexus of the ileum and distal colon, respectively, showed positive immunoreactivity to the P2X3 receptor. Double-labelling studies showed that about 10–25% of the neurons with P2X2 immunoreactivity in myenteric plexus and 30–50% in the submucosal plexus were found to express calbindin or calretinin. About 80% of the neurons with P2X3 receptor immunoreactivity in the myenteric plexus and about 40% in the submucosal plexus expressed calretinin. Approximately 30–75% of the neurons with P2X3 receptor immunoreactivity in the submucosal plexus expressed calbindin, while none of them were found to express calbindin in the myenteric plexus.

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Authors and Affiliations

  1. Autonomic Neuroscience Institute, Royal Free and University College London Medical School, Rowland Hill Street, London, NW3 2PF, UK

    Zhenghua Xiang & Geoffrey Burnstock

  2. Department of Biochemistry and Molecular Biology, Second Military Medical University 200433, Shanghai, P. R. China

    Zhenghua Xiang

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  1. Zhenghua Xiang
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  2. Geoffrey Burnstock
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Correspondence to Geoffrey Burnstock.

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Xiang, Z., Burnstock, G. P2X2 and P2X3 purinoceptors in the rat enteric nervous system. Histochem Cell Biol 121, 169–179 (2004). https://doi.org/10.1007/s00418-004-0620-1

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