Journal
NEUROSCIENCE RESEARCH
Volume 92, Issue -, Pages 46-52Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neures.2014.11.001
Keywords
Ischemic pain; Muscle pain; Acid; Mechanical sensitization; Exercise
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Funding
- [23390154]
- Grants-in-Aid for Scientific Research [25670288, 26350638] Funding Source: KAKEN
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Strong exercise makes muscle acidic, and painful. The stimulus that activates muscle nociceptors in such instance may be protons. Reportedly, however, not many afferents are excited by protons alone. We, therefore, posited that protons sensitize muscular nociceptors to mechanical stimuli. We examined effects of protons on mechanical sensitivity of muscle nociceptors by single-fiber recording from rat muscle-nerve preparations in vitro and by whole cell patch-clamp recording of mechanically activated (MA) currents from cultured rat dorsal root ganglion neurons. We recorded 38 A delta- and C-fibers. Their response magnitude was increased by both pH 6.2 and pH 6.8; in addition the mechanical threshold was, lowered by pH 6.2. Decrease in the threshold by pH6.2 was also observed in MA currents. Presently observed sensitization by protons could be involved in several types of ischemic muscle pain, and may also be involved in cardiovascular and respiratory controls during exercise. (C) 2014 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.
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