Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells
The Korean Journal of Parasitology
; : 679-684, 2016.
Article
en En
| WPRIM
| ID: wpr-130342
Biblioteca responsable:
WPRO
ABSTRACT
Clonorchiasis, caused by direct contact with Clonorchis sinensis worms and their excretory-secretory products (ESPs), is associated with chronic inflammation, malignant changes in bile ducts, and even cholangiocarcinogenesis. Our previous report revealed that intracellular free radicals enzymatically generated by C. sinensis ESPs cause NF-κB-mediated inflammation in human cholangiocarcinoma cells (HuCCT1). Therefore, the present study was conducted to examine the role of upstream Toll-like receptors (TLRs) on the initial host innate immune responses to infection. We found that treatment of HuCCT1 cells with native ESPs induced changes in TLR mRNA levels in a time-dependent manner, concomitant with the generation of free radicals. ESP-mediated free radical generation was markedly attenuated by preincubation of the cells with TLR1-4-neutralizing antibodies, indicating that at least TLR1 through 4 participate in stimulation of the host innate immune responses. These findings indicate that free radicals triggered by ESPs are critically involved in TLR signal transduction. Continuous signaling by this pathway may function in initiating C. sinensis infection-associated inflammation cascades, a detrimental event leading to progression to more severe hepatobiliary diseases.
Palabras clave
Texto completo:
1
Índice:
WPRIM
Asunto principal:
Conductos Biliares
/
ARN Mensajero
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Transducción de Señal
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Clonorquiasis
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Clonorchis sinensis
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Colangiocarcinoma
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Receptores Toll-Like
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Radicales Libres
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Inmunidad Innata
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Inflamación
Límite:
Humans
Idioma:
En
Revista:
The Korean Journal of Parasitology
Año:
2016
Tipo del documento:
Article