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• W2006404209 abstract "Local treatment of rat peripheral nerves with capsaicin induces permanent impairment of afferent C-fiber functions and changes in the response properties of spinal dorsal horn neurons. In this study a new experimental approach, the capsaicin gap technique, has been utilized in an attempt to unravel pathomorphological alterations which commence in the domain of primary sensory neurons as a consequence of perineural treatment with capsaicin. The technique relies on the facts that peripheral nerves in the spinal dorsal horn are represented in a strict somatotopic manner, and on the observation that in the adult rat systemic injection of appropriate doses of capsaicin results in a selective degeneration of primary afferent fibers within Rexed's laminae I and II of the spinal cord. We have assumed that, if treatment of a peripheral nerve with capsaicin results in an irreversible destruction of primary afferent terminals related to that nerve, then the corresponding spinal projection areas will be free of degeneration following a subsequent systemic injection of capsaicin. The topographical distribution of degenerating axon terminals, induced by a systemic injection of capsaicin, was studied within the lumbar spinal cord of rats whose sciatic nerves had been treated with capsaicin or its vehicle one to three months previously. In the dorsal horn ipsilateral to the vehicle-treated nerve, axon terminal degeneration was found in the entire mediolateral extent of Rexed's laminae I and II. In contrast, in the dorsal horn ipsilateral to the capsaicin-treated nerve, virtually no degeneration was observed in areas which correspond to the projection territories of sciatic afferents. It is concluded that the central terminals of capsaicin-sensitive sciatic afferents underwent transganglionic degeneration as a result of prior perineural treatment with capsaicin, and a subsequent systemic injection of this neurotoxin therefore failed to cause axon terminal degeneration in somatotopic areas served by the treated nerve. Comparative quantitative morphometric analysis of cell populations of dorsal root ganglia related to capsaicin- or vehicle-treated nerves disclosed (1) a marked reduction in the proportion of small-sized neurons, (2) a fall of about 80% in the percentage of neurons which undergo degeneration after the systemic injection of capsaicin, and (3) a marked decrease in the total number of neurons in ganglia ipsilateral to the capsaicin-treated nerves. Quantitative electron microscopic studies on saphenous nerves treated perineurally with capsaicin revealed a 32% reduction in the number of unmyelinated axons as compared with the controls, whereas the number of myelinated fibers was unchanged.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W2006404209 date "1990-01-01" @default.
• W2006404209 modified "2023-09-26" @default.
• W2006404209 title "Transganglionic degeneration of capsaicin-sensitive C-fiber primary afferent terminals" @default.
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• W2006404209 doi "https://doi.org/10.1016/0306-4522(90)90286-d" @default.
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