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ASIC3 and Muscle Painby: Chih-Cheng Chen
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AbstractHighly sensitive acid-sensing ion channel 3 (ASIC3) is predominantly distributed in sensory neurons. Moderate acidification (pH 6.7–7.3) can open ASIC3 with sustained inward current, which is suitable for persistent pain sensation evoked by acidosis in arthritis, muscular ischemia, and cancer, for example. Mice with null mutation of ASIC3 show enhanced responses to cutaneous pain stimuli, including heat, pressure, and acetic acid. Also, the hyperalgesia induced by intradermal inflammation is not changed or augmented. This evidence argues against ASIC3 triggering cutaneous pain. In contrast, muscle pain associated with acidosis requires ASIC3 for the development of chronic mechanical hyperalgesia. Therefore, ASIC3 in muscle afferents seems to act as a peripheral initiator of muscle pain associated with acidosis.
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