Targeted damage of the cerebrospinal fluid-contacting nucleus contributes to the pain behavior and the expression of 5-HT and c-Fos in spinal dorsal horn of rats / 中国应用生理学杂志
Chinese Journal of Applied Physiology
;
(6): 218-222, 2014.
Article
Dans Chinois
| WPRIM
| ID: wpr-236342
ABSTRACT
<p><b>OBJECTIVE</b>The changes of pain threshold and expression of 5-hydroxytryptamine(5-HT) and c-Fos in spinal dorsal horn of rats were observed after targetedly damaged the cerebraspinal fluid-contacting nucleus (CSF-contacting nucleus) to provide experimental evidence for the mechanism of regulating pain CSF-contacting nucleus involved in.</p><p><b>METHODS</b>Male adult SD rats were divided into control, sham, choleratoxin subunit B conjugated with horse-radish peroxidase (CB-HRP)and damage groups randomly. The pain threshold using mechanical withdrawal threshold (MWT) and thermal withdrawal latency (TWL) were recorded and analyzed. Immunofluorescence method was used to observe the expression of 5-HT and c-Fos in spinal dorsal horn.</p><p><b>RESULTS</b>Compared with the control, sham and CB-HRP groups, the MWT and TWL of the damage group were significantly increased (P < 0.05). The results of immunofluorescence showed that 5-HT was detected in neurons of CSF-contacting nucleus. In the damage group, the number of neurons of CSF-contacting nucleus reduced gradually, and no survived neurons were observed at the 10th day. Meanwhile, both the expression of 5-HT and c-Fos in spinal dorsal horn increased gradually, and negatively correlated with the change of pain threshold.</p><p><b>CONCLUSION</b>The method of targeted damaging CSF-contacting nucleus by cholera toxin subnit B conjugated with saporin(CB-SAP) is scientific and reliable, and it results in the changes of pain threshold and expression of 5-HT and c-Fos in spinal dorsal horn of rats. This study suggests that CSF-contacting nucleus participate in the regulation of pain, moreover, 5-HT and c-Fos play important roles in this regulation.</p>
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Douleur
/
Chirurgie générale
/
Sérotonine
/
Liquide cérébrospinal
/
Protéines proto-oncogènes c-fos
/
Rat Sprague-Dawley
/
Corne dorsale de la moelle spinale
/
Métabolisme
Limites du sujet:
Animaux
langue:
Chinois
Texte intégral:
Chinese Journal of Applied Physiology
Année:
2014
Type:
Article
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