Toll-like receptor-4/p38 MAPK signaling in the dorsal horn contributes to P2X4 receptor activation and BDNF over-secretion in cancer induced bone pain.
Neurosci Res
; 125: 37-45, 2017 Dec.
Article
en En
| MEDLINE
| ID: mdl-28668500
ABSTRACT
Our previous research suggested that the P2X4 receptor (P2X4R) expression in microglia was involved in the activation of toll-like receptor-4 (TLR4) in the dorsal horn in the rat model of cancer induced bone pain (CIBP). In this study, we focused on whether TLR4- mitogen-activated protein kinases, p38 (p38 MAPK) contributes to P2X4R activation and brain-derived neurotrophic factor (BDNF) over-secretion in CIBP. In in vitro experiment, the results showed that BDNF expression evoked by ATP stimulation was dependent on TLR4-p38. In in vivo experiment, the results demonstrated that an intrathecal injection of TLR4 siRNA alleviated nociception induced by lipopolysaccharide (LPS) plus ATP or CIBP with decreased expression of P2X4R, TLR4, BDNF, interleukin-6 (IL-6) and phosphorylated-p38 MAPK (p-p38 MAPK). Moreover, injection with p38MAPK inhibitor SB203580 resulted in an identical pattern compared with treatment with TLR4 siRNA. Our results demonstrate that the activation of TLR4-p38MAPK-P2X4R signaling in microglial possibility plays an important role in the process of nociceptive transmission in CIBP, suggesting new mechanism and potential therapeutic targets for CIBP.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Neoplasias Óseas
/
Microglía
/
Factor Neurotrófico Derivado del Encéfalo
/
Proteínas Quinasas p38 Activadas por Mitógenos
/
Receptor Toll-Like 4
/
Receptores Purinérgicos P2X4
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Female
/
Humans
Idioma:
En
Revista:
Neurosci Res
Asunto de la revista:
NEUROLOGIA
Año:
2017
Tipo del documento:
Article