Regional expression of P2Y4 receptors in the rat central nervous system |
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Authors: | Xianmin Song Wei Guo Qiang Yu Xiaofeng Liu Zhenghua Xiang Cheng He Geoffrey Burnstock |
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Institution: | (1) Department of Neurobiology, Key Laboratory of Molecular Neurobiology, Ministry of Education, Neuroscience Research Centre of Changzheng Hospital, Second Military Medical University, Shanghai, 200433, People’s Republic of China;(2) Autonomic Neuroscience Centre, University College Medical School, Royal Free Campus, Rowland Hill Street, London, NW3 2PF, UK; |
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Abstract: | P2Y receptors are G protein-coupled receptors composed of eight known subunits (P2Y1, 2, 4, 6, 11, 12, 13, 14), which are involved in different functions in neural tissue. The present study investigates the expression pattern of P2Y4 receptors in the rat central nervous system (CNS) using immunohistochemistry and in situ hybridization. The specificity of
the immunostaining has been verified by preabsorption, Western blot, and combined use of immunohistochemistry and in situ
hybridization. Neurons expressing P2Y4 receptors were distributed widely in the rat CNS. Heavy P2Y4 receptor immunostaining was observed in the magnocellular neuroendocrine neurons of the hypothalamus, red nucleus, pontine
nuclei, mesencephalic trigeminal nucleus, motor trigeminal nucleus, ambiguous nucleus, inferior olive, hypoglossal nucleus,
and dorsal motor vagus nucleus. Both neurons and astrocytes express P2Y4 receptors. P2Y4 receptor immunostaining signals were mainly confined to cell bodies and dendrites of neurons, suggesting that P2Y4 receptors are mainly involved in regulating postsynaptic events. In the hypothalamus, all the vasopressin (VP) and oxytocin
(OT) neurons and all the orexin A neurons were immunoreactive for P2Y4 receptors. All the neurons expressing P2Y4 receptors were found to express N-methyl-d-aspartate receptor 1 (NR1). These data suggest that purines and pyrimidines might be involved in regulation of the release
of the neuropeptides VP, OT, and orexin in the rat hypothalamus via P2Y4 receptors. Further, the physiological and pathophysiological functions of the neurons may operate through coupling between
P2Y4 receptors and NR1. |
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Keywords: | P2Y4 receptor Immunohistochemistry In situ hybridization CNS |
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