書誌事項
- タイトル別名
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- <b>The extracellular ATP-mediated epidermal keratinocyteto-sensory neuron communication; an involvement of </b><b>keratinocytic ATP in induction of pain </b>
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ATP acts as an intercellular messenger in a variety of cells.Here we characterized the Ca2+ wave propagation mediated by extracellular ATP in cultured normal human epidermal keratinocytes (NHEKs) also co-cultured with mouse dorsal root ganglion (DRG) neurons. We also asked about physiological consequence of the ATP-mediated communication in relation to pain by behavioral analysis. Pharmacological characterization showed that NHEKs express functional metabotropic P2Y2 receptors. When a cell was gently stimulated with a glass pipette, an increase in the intracellular Ca2+ concentration ([Ca2+]i) was observed, followed by propagating Ca2+ waves in neighboring cells in an extracellular ATP-dependent fashion. Using an ATP-imaging technique, the release and diffusion of ATP among NHEKs were confirmed. DRG neurons are known to innervate the epidermis that is mainly composed of keratinocytes. In the co-culture of NHEKs and DRG neurons, mechanical stimulation-evoked Ca2+ waves in NHEKs evoked the [Ca2+]i elevation in adjacent DRG neurons,which was also dependent on extracellualr ATP and the activation of P2Y2 receptors. Extracellular ATP is a dominant messenger that forms intercellular Ca2+ waves in NHEKs. In addition, Ca2+ waves in NHEKs could produce a [Ca2+]i elevation in DRG neurons, suggesting dynamic cross talk between skin and sensory neurons mediated by extracellular ATP. Next we investigated a physiological consequence of the ATP-mediated communications. Injection of the P2Y2 and P2Y4 receptor agonist uridine 5'-triphosphate (UTP) into plantar surface in rats produced the mechanical allodynia in a concentration-dependent manner. The UTP-induced mechanical allodynia was inhibited by the P2 receptor antagonist PPADS (pyridoxal-phosphate-6-azophenyl-2',4'-disulfonate) or antisense oligonucleotide for P2Y2 receptors. Taken together, ATP is a key molecule that mediates pain signaling from skin to sensory neurons.
収録刊行物
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- PAIN RESEARCH
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PAIN RESEARCH 21 (3), 133-139, 2006
日本疼痛学会
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詳細情報 詳細情報について
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- CRID
- 1390001204366192640
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- NII論文ID
- 130004839613
- 10018071591
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- NII書誌ID
- AN10195934
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- ISSN
- 21874697
- 09158588
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
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- 抄録ライセンスフラグ
- 使用不可