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Proton-sensing G protein-coupled receptors : ウィキペディア英語版 | Proton-sensing G protein-coupled receptors Proton-sensing G protein-coupled receptors are transmembrane receptors which sense acidic pH and include GPR132 (G2A), GPR4, GPR68 (OGR1) and GPR65 (TDAG8). These G protein-coupled receptors are activated when extracellular pH falls into the range of 6.4-6.8 (typical values are above 7.0). The functional role of the low pH sensitivity of the proton-sensing G protein-coupled receptors is being studied in several tissues where cells respond to conditions of low pH including bone and inflamed tissues. The four known proton-sensing G protein-coupled receptors are Class A receptors in subfamily A15. == Nociception ==
Pain sensation can be initiated by nociceptor cells that are sensory neurons with cell bodies located in the dorsal root ganglia. Some nociceptors respond to low pH and the pH-sensitive amiloride-sensitive cation channel 3 has been described as a modulator of acid-induced pain sensation. However, results with amiloride-sensitive cation channel 3 gene knockout mice suggest that those channels do not fully account for acid-induced pain sensation. Proton-sensing G protein-coupled receptors have been shown to be expressed in small-diameter neurons responsible for nociception where they may play a role in acid-induced pain sensation. Acid-sensing neuron-mediated immediate pungent pain has been associated with acid-sensing ion channels.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Proton-sensing G protein-coupled receptors」の詳細全文を読む
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