Ultra-low dose naloxone restores the antinocicepitve effect of morphine in PTX-treated rats: association of IL-10 upregulation in the spinal cord.
Life Sci
; 91(5-6): 213-20, 2012 Sep 04.
Article
em En
| MEDLINE
| ID: mdl-22820166
AIMS: Ultra-low dose naloxone has been shown to restore the antinociceptive effect of morphine in pertussis toxin (PTX)-treated rats by suppressing spinal microglia activation and inhibiting inflammatory cytokine expression. This study was further investigated the mechanism by which ultra-low dose naloxone promotes analgesia in pertussis toxin-treated rats. MAIN METHODS: Male Wistar rats were implanted with an intrathecal (i.t.) catheter and injected either saline or PTX (1 µg). Four days later, rats randomly received either saline, or ultra-low dose naloxone, or recombinant rat interleukin-10 (rrIL-10) (1 µg) injection followed by saline or morphine (10 µg) 30 min later. In some experiments, mouse anti-rat IL-10 antibody (10 µg) was injected intrathecally into PTX injected rats daily on days 4, 5, 6, and 7. On day 7, ultra-low dose naloxone was given 1h after antibody injection with or without subsequent morphine injection. KEY FINDINGS: PTX injection induced notable thermal hyperalgesia and mechanical allodynia. Injection of ultra-low dose naloxone preserved the antinociceptive effect of morphine in PTX-treated rats and associated an increasing of IL-10 protein expression. Intrathecal injection rrIL-10 alone or in combination with morphine, not only reversed mechanical allodynia but also partially restored the antinociceptive effect of morphine; injection of anti-rat IL-10 antibody attenuated the effect of morphine plus ultra-low dose naloxone on mechanical allodynia and completely inhibited the antinociceptive effect of morphine. SIGNIFICANCE: These results indicate that intrathecal ultra-low dose naloxone induces IL-10 expression in spinal neuron and microglia, which suppresses PTX-induced neuroinflammation and restores the antinociceptive effect of morphine.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Analgésicos Opioides
/
Morfina
/
Naloxona
/
Antagonistas de Entorpecentes
Tipo de estudo:
Prognostic_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Life Sci
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Taiwan
País de publicação:
Holanda