التفاصيل البيبلوغرافية
| العنوان: |
Nociceptive stimulation activates locus coeruleus neurones projecting to the somatosensory thalamus in the rat. |
| المؤلفون: |
Voisin, D. L., Guy, N., Chalus, M., Dallel, R. |
| المصدر: |
Journal of Physiology; Aug2005, Vol. 566 Issue 3, p929-937, 9p, 3 Diagrams, 1 Chart |
| مصطلحات موضوعية: |
NORADRENERGIC mechanisms, SYMPATHETIC nervous system, LOCUS coeruleus, NEURONS, NEURAL stimulation |
| مستخلص: |
In the thalamus, noradrenergic output from the pontine nucleus locus coeruleus (LC) may actively shape the response properties of various sensory networks en route to the cortex. Little is known, however, about the involvement of ascending noradrenergic innervation of the somatosensory thalamus in the processing of nociceptive information. To address this question, we combined the study of Fos expression upon nociceptive tooth pulp stimulation in the anaesthetized rat, with the detection of retrogradely traced neurones from the somatosensory thalamus. Cell bodies labelled retrogradely from the left thalamus were observed on both sides of the LC, with an ipsilateral predominance ( n= 8). Electrical stimulation of the right incisor pulp ( n= 4) provoked a significantly stronger Fos expression (around twice) than sham surgery ( n= 4), in both the ipsi- and contralateral LC. Significantly larger numbers of double labelled neurones were counted in the LC of tooth-pulp-stimulated animals (representing around 30% of retrogradely labelled cells in LC) than in the LC of sham animals. They were found bilaterally, but with a clear, significant, ipsilateral (i.e. left) predominance. The present data offer an anatomical framework to understand how the LC is involved in the sensory processing of nociceptive information in the thalamus. For the first time, it is shown that nociceptive stimulation activates LC neurones projecting to the somatosensory thalamus. This suggests a new role for LC in modulating nociception within the thalamus. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Physiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder