|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5629167||1580140||2018||14 صفحه PDF||سفارش دهید||دانلود کنید|
- Increasing-intensity treadmill exercise (iTR) reduces neuropathic pain by increasing NE and 5HT functions.
- After peripheral nerve injury iTR restored the expression of 5HT2A, Î±1A and Î²2 receptors in spinal cord and brainstem areas.
- Particularly, iTR increased Î±1A, Î²2 and 5HT2A receptors expression in the PAG-DRN and PAG-LC pathways for pain modulation.
This study characterizes the impact of increasing-intensity treadmill exercise (iTR) on noradrenergic (NE) and serotonergic (5HT) modulation of neuropathic pain. Following sciatic nerve transection and repair (SNTR) rats developed significant mechanical and thermal hyperalgesia that was partially prevented by iTR performed during the first 2Â weeks after injury.Marked decrease in the expression of 5HT2A and Î±1A and Î²-, but not Î±2A adrenergic receptors in the spinal cord dorsal horn was associated to SNTR and recovered by iTR, particularly in lamina II. iTR significantly increased 5HT2A in periaqueductal grey (PAG), raphe magnus (RM) and dorsal raphe nucleus (DRN), with a pattern suggesting reorganization of serotonergic excitatory interconnections between PAG and DRN. iTR also increased the expression of Î±1A in locus coeruleus (LC) and DRN, and Î²2 in LC, indicating that exercise enhanced activity of NE neurons, likely by activating autologous projections from DRN and PAG.iTR hypoalgesia was antagonized by blockade of Î²2 and 5HT2A receptors with administration of butoxamine and ketanserin. The neurotoxin DSP4 was injected to induce depletion of NE projections from LC before starting iTR. DSP4 treatment worsened mechanical hyperalgesia, but iTR hypoalgesia was similarly produced. Moreover, 5HT2A expression in LC further increased after DSP4 injection, all these results suggesting an intrinsic regulation of 5HT and NE activity between PAG, DRN and LC neurons activated by iTR.Finally, iTR significantly reduced microglial reactivity in LC and increased non-microglial BDNF expression, an effect that was reverted by butoxamine, implicating BDNF regulation in central 5HT/NE actions on neuropathic pain.
Journal: Experimental Neurology - Volume 299, Part A, January 2018, Pages 42-55