Abstract
Crush lesion of a skin nerve is followed by sprouting of myelinated (A) and unmyelinated (C) afferent fibers into the distal nerve stump. Here, we investigate quantitatively both ongoing activity and activity evoked by mechanical or thermal stimulation of the nerve in 43 A- and 135 C-fibers after crush lesion of the sural nerve using neurophysiological recordings in anesthetized rats. The discharge patterns in the injured afferent nerve fibers and in intact (control) afferent nerve fibers were compared. (1) Almost all (98%) A-fibers were mechanosensitive, some of them exhibited additionally weak cold/heat sensitivity; 7% had ongoing activity. (2) Three patterns of physiologically evoked activity were present in the lesioned C-fibers: (a) C-fibers with type 1 cold sensitivity (low cold threshold, inhibition on heating, high level of ongoing and cold-evoked activity; 23%): almost all of them were mechanoinsensitive and 40% of them were additionally heat-sensitive; (b) C-fibers with type 2 cold sensitivity (high cold threshold, low level of ongoing and cold-evoked activity; 23%). All of them were excited by mechanical and/or heat stimuli; (c) cold-insensitive C-fibers (54%), which were heat- and/or mechanosensitive. (3) The proportions of C-fibers exhibiting these three patterns of discharge to physiological stimuli were almost identical in the population of injured C-fibers and in a population of 91 intact cutaneous C-fibers. 4. Ongoing activity was present in 56% of the lesioned C-fibers. Incidence and rate of ongoing activity were the same in the populations of lesioned and intact type 1 cold-sensitive C-fibers. The incidence (but not rate) of ongoing activity was significantly higher in lesioned type 2 cold-sensitive and cold insensitive C-fibers than in the corresponding populations of intact C-fibers (42/93 fibers vs. 11/72 fibers).
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Acknowledgements
This paper is dedicated to Prof. Dr. Dr. Robert Schmidt. The research was supported by the German Ministry of Education and Research (German Research Network on Neuropathic Pain [DFNS]), German Research Foundation and Pfizer. The second affiliation of Dr. Natalia Gorodetskaya is: Pavlov Institute of Physiology of the Russian Academy of Sciences, Nab. Makarova 6, 199034 St. Petersburg, Russia.
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Jänig, W., Grossmann, L. & Gorodetskaya, N. Mechano- and thermosensitivity of regenerating cutaneous afferent nerve fibers. Exp Brain Res 196, 101–114 (2009). https://doi.org/10.1007/s00221-008-1673-5
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DOI: https://doi.org/10.1007/s00221-008-1673-5