Fedotozine, a kappa-opioid agonist, prevents spinal and supra-spinal Fos expression induced by a noxious visceral stimulus in the rat.
Neurogastroenterol Motil
; 12(2): 135-47, 2000 Apr.
Article
em En
| MEDLINE
| ID: mdl-10771495
ABSTRACT
Fedotozine, a kappa opioid agonist, reverses digestive ileus caused by acetic acid (AA)-induced visceral pain in rats. The aims of this study were to map, in conscious rats, central pathways activated by AA using Fos as a marker of neuronal activation; to characterize primary afferent fibres involved in this activation; and to investigate the effect of fedotozine on AA-induced Fos expression. AA (0.6%; 10 mL kg-1) was injected i.p. in conscious rats either untreated; pretreated 14 days before with capsaicin; pretreated 20 min previously with fedotozine; or pretreated 2 h prior to fedotozine with the kappa-antagonist nor-binaltorphimine (nor-BNI). Controls received the vehicle alone. 60 min after injection of AA, rats were processed for Fos immunohistochemistry. Visceral pain was assessed by counting abdominal cramps. AA induced Fos in the thoraco-lumbar spinal cord (laminae I, V, VII and X) and numerous brain structures such as the nucleus tractus solitarius, and paraventricular nucleus (PVN) of the hypothalamus, whereas almost no Fos labelling was observed in controls. Capsaicin pretreatment blocked AA-induced Fos in all structures tested. Fedotozine significantly decreased AA-induced abdominal cramps and Fos immunoreactivity in the spinal cord and PVN, this effect being reversed by nor-BNI pretreatment. AA induces Fos in the spinal cord and numerous brain nucuei, some of which are involved in the control of digestive motility in rats. This effect is mediated through capsaicin-sensitive afferent fibres and prevented by fedotozine most likely through a peripheral action on visceral afferents.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Propilaminas
/
Medula Espinal
/
Compostos de Benzil
/
Encéfalo
/
Dor Abdominal
/
Regulação da Expressão Gênica
/
Proteínas Proto-Oncogênicas c-fos
/
Genes fos
/
Receptores Opioides kappa
/
Obstrução Intestinal
Limite:
Animals
Idioma:
En
Revista:
Neurogastroenterol Motil
Assunto da revista:
GASTROENTEROLOGIA
/
NEUROLOGIA
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
França