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Improvements in impaired GABA and GAD65/67 production in the spinal dorsal horn contribute to exercise-induced hypoalgesia in a mouse model of neuropathic pain.
Kami, Katsuya; Taguchi Ms, Satoru; Tajima, Fumihiro; Senba, Emiko.
Afiliação
  • Kami K; Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama City, Wakayama, Japan kami@wakayama-med.ac.jp.
  • Taguchi Ms S; Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama City, Wakayama, Japan.
  • Tajima F; Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama City, Wakayama, Japan.
  • Senba E; Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama City, Wakayama, Japan Department of Physical Therapy, Osaka Yukioka College of Health Science, Ibaraki City, Osaka, Japan.
Mol Pain ; 122016.
Article em En | MEDLINE | ID: mdl-27030712
BACKGROUND: Physical exercise effectively attenuates neuropathic pain, and multiple events including the inhibition of activated glial cells in the spinal dorsal horn, activation of the descending pain inhibitory system, and reductions in pro-inflammatory cytokines in injured peripheral nerves may contribute to exercise-induced hypoalgesia. Since fewer GABAergic hypoalgesic interneurons exist in the dorsal horn in neuropathic pain model animals, the recovery of impaired GABAergic inhibition in the dorsal horn may improve pain behavior. We herein determined whether the production of gamma-aminobutyric acid (GABA) and glutamic acid decarboxylase (GAD) in the dorsal horn is restored by treadmill running and contributes to exercise-induced hypoalgesia in neuropathic pain model mice. C57BL/6 J mice underwent partial sciatic nerve ligation (PSL). PSL-Runner mice ran on a treadmill at 7 m/min for 60 min/day, 5 days/week, from two days after PSL. RESULTS: Mechanical allodynia and heat hyperalgesia developed in PSL-Sedentary mice but were significantly attenuated in PSL-Runner mice. PSL markedly decreased GABA and GAD65/67 levels in neuropils in the ipsilateral dorsal horn, while treadmill running inhibited these reductions. GABA+ neuronal nuclei+ interneuron numbers in the ipsilateral dorsal horn were significantly decreased in PSL-Sedentary mice but not in PSL-Runner mice. Pain behavior thresholds positively correlated with GABA and GAD65/67 levels and GABAergic interneuron numbers in the ipsilateral dorsal horns of PSL-Sedentary and -Runner mice. CONCLUSIONS: Treadmill running prevented PSL-induced reductions in GAD65/67 production, and, thus, GABA levels may be retained in interneurons and neuropils in the superficial dorsal horn. Therefore, improvements in impaired GABAergic inhibition may be involved in exercise-induced hypoalgesia.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Condicionamento Físico Animal / Corno Dorsal da Medula Espinal / Ácido gama-Aminobutírico / Glutamato Descarboxilase / Neuralgia Limite: Animals Idioma: En Revista: Mol Pain Assunto da revista: BIOLOGIA MOLECULAR / NEUROLOGIA / PSICOFISIOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Japão País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Condicionamento Físico Animal / Corno Dorsal da Medula Espinal / Ácido gama-Aminobutírico / Glutamato Descarboxilase / Neuralgia Limite: Animals Idioma: En Revista: Mol Pain Assunto da revista: BIOLOGIA MOLECULAR / NEUROLOGIA / PSICOFISIOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Japão País de publicação: Estados Unidos