Chapter title |
Translational Research in Pain and Itch
|
---|---|
Chapter number | 3 |
Book title |
Translational Research in Pain and Itch
|
Published in |
Advances in experimental medicine and biology, January 2016
|
DOI | 10.1007/978-94-017-7537-3_3 |
Pubmed ID | |
Book ISBNs |
978-9-40-177535-9, 978-9-40-177537-3
|
Authors |
Wan-Ru, Duan, Yi-Kuan, Xie, Wan-Ru Duan, Yi-Kuan Xie, Duan, Wan-Ru, Xie, Yi-Kuan |
Abstract |
To understand the mechanisms of neuropathic pain caused by demyelination, a rapid-onset, completed but reversible demyelination of peripheral A-fibers and neuropathic pain behaviors in adult rats by single injection of cobra venom into the sciatic nerve, was created. Microfilament recording revealed that cobra venom selectively blocked A-fibers, but not C-fibers. Selective blockade of A-fibers may result from A-fiber demyelination at the site of venom injection as demonstrated by microscope examination. Neuropathic pain behaviors including inflammatory response appeared almost immediately after venom injection and lasted about 3 weeks. Electrophysiological studies indicated that venom injection induced loss of conduction in A-fibers, increased sensitivity of C-polymodal nociceptors to innocuous stimuli, and triggered spontaneous activity from peripheral and central terminals of C-fiber nociceptors. Neurogenic inflammatory responses were also observed in the affected skin via Evans blue extravasation experiments. Both antidromic C-fiber spontaneous activity and neurogenic inflammation were substantially decreased by continuous A-fiber threshold electric stimuli applied proximally to the venom injection site. The data suggest that normal activity of peripheral A-fibers may produce inhibitory modulation of C-polymodal nociceptors. Removal of inhibition to C-fiber polymodal nociceptors following demyelination of A-fibers may result in pain and neurogenic inflammation in the affected receptive field. |
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