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• W2012134017 abstract "In this electrophysiological study, changes in the responsiveness of neurons in the primary somatosensory (SmI) cortex in rats were analyzed during the development of carrageenin (CRG)-induced inflammation, an animal model of acute inflammatory hyperalgesia. SmI neurons were characterized as responding to non-noxious light touch, non-noxious articular movement, or noxious pinch. A total of 23 neurons so characterized in three groups were recorded for 60 min (17 of these neurons were recorded for up to 150 min) after an intraplantar injection of CRG. The possible modifications in their background and evoked activities were analyzed over this period of time. After CRG administration, cells responding to noxious pinch stimuli (n = 8) showed a nonsignificant increase in spontaneous activity, but a significant increase in their evoked response to pinch. These results were quite similar to past observations in the ventrobasal nucleus of the thalamus (VB). Cells responding to non-noxious articular stimulation (n = 6) showed variable modifications and no significant increase in the mean evoked response for up to 60 min. These results for articular cells were also quite comparable to results seen for VB responses for similar cells. However, mean spontaneous activity, which showed a highly variable increase, was significantly increased after 60 min. The depressive effect of a local anesthetic, Xylocaine, was tested on the activities of four cells (one pinch, three light touch units) 60 min after CRG administration over a 20-min interval. Xylocaine was found to depress both spontaneous activity and responses to the effective somatic stimulus, thereby implying that the observed central modifications in neuronal discharge are linked to the peripheral inflammation. Modifications observed for each group of cells are compared with past observations in peripheral fibers, in spinal dorsal horn neurons, and especially in the VB under similar inflammatory conditions. These data confirm that the SmI cortex is involved in the nociceptive process. Furthermore, the contrast between some modifications observed at this level and past observations under similar inflammatory conditions suggests a unique role of some cortical neurons, which might partially account for mechanical allodynia." @default.
• W2012134017 created "2016-06-24" @default.
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• W2012134017 date "1992-01-01" @default.
• W2012134017 modified "2023-09-23" @default.
• W2012134017 title "Further Evidence for the Involvement of SmI Cortical Neurons in Nociception: Modifications of Their Responsiveness over the Early Stage of a Carrageenin-Induced Inflammation in the Rat" @default.
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• W2012134017 doi "https://doi.org/10.3109/08990229209144775" @default.
• W2012134017 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1414121" @default.
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