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- W1597314866 abstract "Proinflammatory cytokines may sensitize primary sensory neurons and facilitate development of neuropathic pain processes after peripheral nerve injury. The goal of this study was to determine whether responses of dorsal root ganglion (DRG) neurons to exogenous tumor necrosis factor alpha (TNF-alpha) are altered in a chronically compressed DRG (CCD) injury model. Extracellular recordings from teased dorsal root microfilaments demonstrated that acute topical application of TNF-alpha to the DRG for 15 min evoked C- and Abeta-fiber responses in both normal and CCD rats. However, the response latency was significantly shorter, and the peak discharge rate was higher, in CCD fibers than in normal fibers. Intracellular recordings from small- and large-sized neurons showed that TNF-alpha induced greater depolarization and greater decrease in rheobase in CCD neurons than in normal neurons. The proportion of both small- and large-sized neurons that were responsive to TNF-alpha increased significantly after CCD injury. Furthermore, TNF-alpha altered the discharge patterns of large, spontaneously active neurons in addition to enhancing their discharge rates. However, the depolarization caused by TNF-alpha in such neurons was minor (<2 mV). Inflammatory cytokines such as TNF-alpha increased the sensitivity of sensory neurons in normal and CCD rats. The CCD injury itself, on the other hand, increased neuronal responses to inflammatory cytokines." @default.
- W1597314866 created "2016-06-24" @default.
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- W1597314866 date "2002-09-01" @default.
- W1597314866 modified "2023-10-15" @default.
- W1597314866 title "Increased Sensitivity of Sensory Neurons to Tumor Necrosis Factor α in Rats With Chronic Compression of the Lumbar Ganglia" @default.
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- W1597314866 doi "https://doi.org/10.1152/jn.2002.88.3.1393" @default.
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