Abstract：
:Extracellular purine nucleotides and nucleosides play important roles in the nervous system, e.g., neurotransmission, neuromodulation, chemoattraction and acute inflammation. Extracellular nucleotides act through ATP receptors (P2 receptors). P2 receptors are classified into two families: the P2X receptors are ionotropic ligand-gated ion channels and the P2Y receptors are metabotropic G-protein-coupled receptors. Currently, seven P2X receptors (P2X1-7) and eight P2Y receptors (P2Y1, P2Y2, P2Y4, P2Y6, P2Y11, P2Y12, P2Y13 and P2Y14) are recognized. In the sensory nervous system, ATP is suggested to be one of first mediators of tissue damage, which activates primary afferents. Nerve injury often leads to neuropathic pain, such as mechanical allodynia and painful responses to normally innocuous stimuli. Peripheral nerve injury induces the upregulation of molecules in activated microglia in the spinal cord. Microglia in the spinal cord may play an important role in the development and maintenance of neuropathic pain. A prominent signaling pathway in the development of neuropathic pain involves ATP acting on microglial purinergic receptors. This review focuses on the expression of P2X and P2Y receptors mRNAs in the pain transmission pathway, i.e., in the dorsal root ganglion (DRG) and spinal cord. Furthermore, we suggest that the multiple microglial P2Y receptors activated by peripheral nerve injury may play a key role in the development of neuropathic pain.
journal_name
Anat Sci Intjournal_title
Anatomical science internationalauthors
Kobayashi K,Yamanaka H,Noguchi Kdoi
10.1007/s12565-012-0163-9subject
Has Abstractpub_date
2013-01-01 00:00:00pages
10-6issue
1eissn
1447-6959issn
1447-073Xjournal_volume
88pub_type
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