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Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells

Young Yil Bahk1, Jhang Ho Pak2,*
The Korean Journal of Parasitology 2016;54(5):679-684.
Published online: October 31, 2016

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*Corresponding author (jhpak@amc.seoul.kr)
• Received: July 14, 2016   • Revised: August 24, 2016   • Accepted: August 25, 2016

Copyright © 2016 by The Korean Society for Parasitology and Tropical Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • 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.
  • Key words: Clonorchis sinensis, Toll-like receptor (TLR), free radical, excretory-secretory product (ESP), cholangiocarcinoma cell line
Members of the Toll-like receptor (TLR) family are among the most important intra- and extracellular ligand-recognition receptors, which actively function as potent initiators of host innate immune responses and activate proinflammatory signaling cascades [1,2]. TLRs are evolutionarily highly conserved molecules. They recognize molecular patterns on pathogenic organisms and anti-pathogenic functions of the host, and assemble the immune responses for effectiveness against specific pathogens. TLR-mediated inflammation is a primary protective host response to ensure exclusion of detrimental threats caused by infectious agents, and promotes healing [3]. TLRs play a central role in the detection of pathogens by recognizing pathogen-associated molecular patterns derived from a variety of pathogens or host-derived, damage-associated molecular patterns [4]. To date, at least 10 members of the TLR family have been identified in humans, although not all have been assigned a specific ligand. Various cells are able to discriminate between infectious pathogens, based on their profiles of TLR and proinflammatory mediators, and differential expression patterns. This enables diverse responses against different types of pathogens [5–7]. However, prolonged inflammation resulting from excessive production of inflammatory cytokines and chemokines via TLR-mediated signaling events can be detrimental owing to host toxicity and tissue damage. Thus, while T-helper 1 (Th1)-based inflammatory consequences orchestrated by TLRs are involved in eliminating pathogenic infections, they may also induce fatal pathogenic consequences [8]. Similarly, the pathogen-modulated Th2-based TLR-mediated signaling pathway develops immune responses beneficial for the pathogen, leading to disease progression.
Clonorchiasis, caused by chronic infection with Clonorchis sinensis, is an undeniable public health problem in endemic regions of Southeast Asian countries. These flukes reside in the peripheral bile ducts of infected individuals for long periods, provoking pathological changes in the bile ducts and surrounding liver tissues, including inflammation, metaplasia of mucin-producing cells in the mucosa, progressive periductal fibrosis, and hyperplasia of epithelial cells. In particular, persistent injury and inflammation of bile duct epithelia, resulting from both mechanical and chemical irritation, contribute to clonorchiasis-associated cholangiocarcinogenesis. Mechanical damage is caused by physical contact with worms during their feeding and migratory activities, whereas chemical damage is caused by their excretory-secretory products (ESPs). The ESPs are predominantly composed of various proteins, some of which are immune reactive with the sera of C. sinensis-infected patients [9]. Cells exposed to live fluke ESPs display diverse pathophysiological responses, including proliferation, apoptosis, and inflammation [10–13].
We previously reported that treatment of HuCCT1 human cholangiocarcinoma (CCA) cells with C. sinensis ESPs results in elevated levels of intracellular free radicals in a dose- and time-dependent manner, due to activation of NADPH oxidase (NOX), xanthine oxidase (XO), and inducible nitric oxide synthase (iNOS). The enzymatic production of free radicals subsequently participates in NF-κB-mediated inflammation [13,14]. Since TLRs are known to function as sensors for innate and adaptive immune responses during helminth infection [15], we examined feasible roles of TLRs in the generation of free radicals, a prerequisite step for the NF-κB-mediated inflammatory response to C. sinensis ESPs.
C. sinensis ESPs were prepared as described previously [13]. HuCCT1 cells were cultured in RPMI 1640 medium (Life Technologies, Grand Island, New York, USA) supplemented with 10% FBS and an antibiotic mixture. For CsESP treatment, cells were seeded at −70% confluence and grown for 24 hr under standard culture conditions. Cells were gradually deprived of serum by incubating in 1% FBS, followed by incubation in serum-free medium for 3 hr. These serum-starved cells were incubated with 800 ng/mL CsESP for the indicated times.
Heat-denatured ESPs failed to induce the production of intracellular free radicals, as assessed by the detection of fluorescent probes:5-(and-6)-chloromethyl-2′, 7′-dihydrodichlorofluorescein diacetate acetyl ester (CM-H2DCFDA) for detection of reactive oxygen species (ROS), and 4-amino-5-methylamino-2′, 7′-dichlorofluorescein diacetate (DAF-FM) (Molecular Probes, Eugene, Oregon, USA) for detection of reactive nitrogen species (RNS). This result indicates that native protein components in CsESP are responsible for triggering free radical generation in the cells (Fig. 1).
For analysis of TLR mRNA expression, total RNA was extracted from CsESP-treated cells at each time point, using an RNeasy mini kit (Qiagen, Valencia, California, USA), and a semi-quantitative RT-PCR was performed according to the manufacturers’ instructions (SuperScript II First-strand, Invitrogen, Carlsbad, California, USA; ExTaq, TaKaRa Bio, Inc., Shiga, Japan). Table 1 depicts the primer pairs used for RT-PCR, which were designed using PrimerDesigner software to target the cDNA sequences for each human TLR isoform in the GeneBank database. The sequences of the primer pair targeting glyceraldehyde-3-phosphate dehyrogenase (GAPDH), used as an internal control, were as follows: 5′-ACCCAGAAGACTGTGGATGG-3′ (forward) and 5′-CAGGAATG-AGCTTGACAAAG-3′ (reverse). PCR products were separated on 1.0% agarose gels, and images were captured for quantitation of DNA band densities. We observed that mRNA levels of TLR2, 3, and 5 were relatively abundant compared with those of other TLR isoforms, and TLR9 was not detectable (data not shown). Consistent with this finding, a SV40-transformed normal human cholangiocyte cell line (H69) has been shown to express all the known TLR (1–10) mRNAs to different amounts [16]. The absence of TLR9 in HuCCT1 cells was probably due to the specific cell-type. The differences between the different cell types may be attributed to their classification as cancerous versus non-cancerous bile duct epithelial cells. The CsESP treatment resulted in elevated levels of TLR1, 2, 3, 4, 5, and 7 transcripts in a time-dependent manner. However, no change was evident in TLR6 mRNA expression during the entire period of ESP exposure (Fig. 2). Significant increases in levels of TLR2 and 3 were observed as early as 1 hr, TLR5 and 7 after 3 hr, and TLR1 and 4 after 9 hr of ESP exposure. Elevated expression was maintained for up to 24 hr of ESP exposure. The expression of TLR8 mRNA increased at 1 hr, reached a maximal level at 3 hr, and then dramatically decreased to a level below that of an untreated control between 15 and 24 hr of exposure. The level of TLR10 mRNA expression gradually declined between 15 and 24 hr of ESP exposure. The differential biphasic patterns of TLR isoform mRNA expression in response to ESPs remains to be elucidated. Although various pathogens typically cause induction of TLR expression, down-regulation of TLR expression seems to be a critical strategy for the success of specific pathogens [17]. These findings suggest that C. sinensis ESPs may be rich in agonists for several members of the TLR family, thus contributing to various host innate immune responses. It has been also reported that expression of TLR2 and 4 is induced by ESPs from Opisthorchis viverrini [18,19]. Since TLRs recognize pathogen-associated molecular patterns that are expressed on infectious agents, host cells may recognize liver fluke ESPs through differential activation of TLRs, leading to either the development of effective immunity or pathologic progression, such as activation of the innate mucosal inflammation cascade. In the mouse model for clonorchiasis, the expression of TLR2 and 4 mRNA and proteins in infected livers is up-regulated relatively early in infection (day 28 post-infection), indicating that both TLR2 and TLR4 participate in the stimulation of the innate immune response during C. sinensis infection [20].
To take into accounts the involvement of TLRs in free radical generation, ESP-induced TLR activation was blocked using functional grade monoclonal antibodies against TLR1, 2, 3, or 4 (Affymetrix-eBioscience, San Diego, California, USA), followed by a DCF fluorescence assay. The TLR1 through 4 antibodies were employed for this purpose, since they are the only ones functionally proven and commercially available to our knowledge. As shown in Fig. 3, blockage of individual TLRs resulted in approximately 12–27% reduction in the ROS generation triggered by ESPs. This reduction effect was further enhanced when anti-TLR antibodies were added in combination. Reduction rates were proportional to the number of TLR members targeted by the antibodies (addition of 2 combined antibodies resulted in 17–43% reduction in ROS levels, and addition of 3 antibodies resulted in 36–54% reduction). In particular, pretreatment with a combination of antibodies (TLR2, 3, and 4, or TLR1, 2, 3, and 4) suppressed ROS generation by −55% relative to that triggered by ESP treatment alone, indicating a synergistic inhibitory effect. As assessed by a DAF fluorescence assay, RNS levels also decreased in proportion to the number of anti-TLR antibodies combined in the samples (data not shown). These results suggest that free radical generation in HuCCT1 cells exposed to C. sinensis ESPs may be partially mediated by the activation of various members of the TLR family, which is a prerequisite for signaling downstream NF-κB-induced inflammation.
Endogenous free radicals originate from multiple sources, including the electron transport chain in mitochondria and enzymatic reactions involving NOX, XO, NOS, lipoxygenases, and cyclooxygenases. Depending on the levels generated, free radicals may cause serious cellular injury and contribute to the pathogenesis of several diseases. They may also act as secondary messengers for signal transduction and gene regulation in a variety of cell types under diverse biological conditions. During inflammation and immune responses, activated phagocytic cells generate a free radical-dependent respiratory burst that directs toxicity toward invading pathogens. In addition to their antiseptic functions, release of free radicals by damaged tissues recruits inflammatory cells to the sites of injury, thus demonstrating that free radicals can orchestrate inflammatory responses [21]. Increasing lines of evidence indicate that ROS-generating NOXs in non-phagocytic cells function as key players in TLR-mediated intracellular cascades, which activate redox-dependent transcription factors, such as NF-κB and AP-1, as well as cytokine production following a variety of inflammatory stimuli [7]. Therefore, it is tempting to speculate that C. sinensis ESPs activate the host inflammatory signaling cascade, partially through TLRs. Disruption of host cellular redox homeostasis and prolonged endogenous crosstalk between free radicals and TLR activation exacerbate a chronic inflammatory environment in the bile duct epithelium and surrounding liver tissues, eventually leading to the development of more severe hepatobiliary abnormalities. Further examination of TLR-mediated pathophysiologic processes in response to CsESP, including their regulation and the interaction between TLRs, is necessary to elucidate the mechanisms underlying the progression and cause of clonorchiasis-associated disorders.

CONFLICT OF INTEREST

We have no conflict of interest related to this study.

This work was supported by a grant from the National Research Foundation of Korea (NRF) funded by the Korea Government (MEST) (NO. 2012R1A2A2A01014237).
Fig. 1
Intracellular free radical generation in native ESP-treated HuCCT1 cells. Serum-starved cells grown on Aclar plates were incubated in phenol red-free medium containing 800 ng/ml native or heat-denatured ESPs for 9 hr. Cells were then washed with Hank’s balanced salt solution (HBSS) and were treated with 10 μM of CM-H2DCFDA (for ROS detection) or 5 μM of DAF-FM (for RNS detection) for 30 min at 37°C in the dark. After washing with HBSS, cells were fixed, air dried, and inversely applied to slides with mounting solution. Images were captured under a fluorescent microscope equipped with a standard FITC excitation/emission filter. To avoid photooxidation of the fluorescent probes, the fluorescent images were collected with a single rapid scan and identical parameters. Original magnification ×100.
kjp-54-5-679f1.gif
Fig. 2
Effect of ESPs on expression of TLR mRNA isoforms. HuCCT1 cells were treated with 800 ng/ml ESPs, harvested between 0 and 24 hr, and subjected to semi-quantitative RT-PCR analysis. Individual data were quantified as densitometric units, and normalized with GAPDH mRNA. Data in the graph are shown as fold changes relative to the 0 hr time point, and presented as means±SE of 3 independent experiments (*P<0.05, compared with 0 hr).
kjp-54-5-679f2.gif
Fig. 3
Inhibitory effect of TLR1, 2, 3, and 4 neutralization on ESP-triggered ROS generation. HuCCT1 cells grown in 48-well plates were preincubated with the indicated single or combined TLR monoclonal antibodies for 2 hr, and then treated with 800 ng/ml CsESP for 9 hr. The total concentration of antibodies in each well was maintained by the addition of non-specific IgG. After incubation with CM-H2DCFDA, the levels of DCF fluorescence were measured using a spectrofluorometer with excitation and emission wavelengths of 485 and 538 nm, respectively. The value for background fluorescence measured for empty wells was subtracted from all other values. Values were converted to percentages for comparison with control treated with only CsESP. Values are presented as means±SE of 3 independent experiments (*P<0.05, compared with the ESP only-treated control).
kjp-54-5-679f3.gif
Table 1
Primer sequences for amplification of TLR isoforms by RT-PCR
Table 1
Gene name Direction Primers Amplicon size (bp)
TLR1 Forward 5′- CGTAAAACTGGAAGCTTTGCAAGA -3′ 890
Reverse 5′- CCTTGGGCCATTCCAAATAAGTCC -3′
TLR2 Forward 5′- GGCCAGCAAATTACCTGTGTG -3′ 615
Reverse 5′- CCAGGTAGATCTTGGTGTTCA -3′
TLR3 Forward 5′- ACATCCCTGAGCTGTCAAGC -3′ 320
Reverse 5′- CCGCCTCAAAGTCCCTTTCT -3′
TLR4 Forward 5′- CTGCAATGGATCAAGGACCA -3′ 623
Reverse 5′- TCCCACTCCAGGTAAGTGTT -3′
TLR5 Forward 5′- CATTGTATGCACTGTCACTC -3′ 486
Reverse 5′- CCACCACCATGATGAGAGCA -3′
TLR6 Forward 5′- TAGGTCTCATGACGAAGGAT -3′ 1,108
Reverse 5′- GGCCACTGCAAATAACTCCG -3′
TLR7 Forward 5′- AGTGTCTAAAGAACCTGG -3′ 545
Reverse 5′- CTTGGCCTTACAGAAATG -3′
TLR8 Forward 5′- CAGAATAGCAGGCGTAACACATCA -3′ 637
Reverse 5′- AATGTCACAGGTGCATTCAAAGGG -3′
TLR9 Forward 5′- TTATGGACTTCCTGCTGGAGGTGC -3′ --
Reverse 5′- CTGCGTTTTGTCGAAGACCA -3′
TLR10 Forward 5′- CAATCTAGAGAAGGAAGATGGTTC -3′ 659
Reverse 5′- GCCCTTATAAACTTGTGAAGGTGT -3′
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Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells
Korean J Parasitol. 2016;54(5):679-684.   Published online October 31, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.5.679
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Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells
Korean J Parasitol. 2016;54(5):679-684.   Published online October 31, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.5.679
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Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells
Image Image Image
Fig. 1 Intracellular free radical generation in native ESP-treated HuCCT1 cells. Serum-starved cells grown on Aclar plates were incubated in phenol red-free medium containing 800 ng/ml native or heat-denatured ESPs for 9 hr. Cells were then washed with Hank’s balanced salt solution (HBSS) and were treated with 10 μM of CM-H2DCFDA (for ROS detection) or 5 μM of DAF-FM (for RNS detection) for 30 min at 37°C in the dark. After washing with HBSS, cells were fixed, air dried, and inversely applied to slides with mounting solution. Images were captured under a fluorescent microscope equipped with a standard FITC excitation/emission filter. To avoid photooxidation of the fluorescent probes, the fluorescent images were collected with a single rapid scan and identical parameters. Original magnification ×100.
Fig. 2 Effect of ESPs on expression of TLR mRNA isoforms. HuCCT1 cells were treated with 800 ng/ml ESPs, harvested between 0 and 24 hr, and subjected to semi-quantitative RT-PCR analysis. Individual data were quantified as densitometric units, and normalized with GAPDH mRNA. Data in the graph are shown as fold changes relative to the 0 hr time point, and presented as means±SE of 3 independent experiments (*P<0.05, compared with 0 hr).
Fig. 3 Inhibitory effect of TLR1, 2, 3, and 4 neutralization on ESP-triggered ROS generation. HuCCT1 cells grown in 48-well plates were preincubated with the indicated single or combined TLR monoclonal antibodies for 2 hr, and then treated with 800 ng/ml CsESP for 9 hr. The total concentration of antibodies in each well was maintained by the addition of non-specific IgG. After incubation with CM-H2DCFDA, the levels of DCF fluorescence were measured using a spectrofluorometer with excitation and emission wavelengths of 485 and 538 nm, respectively. The value for background fluorescence measured for empty wells was subtracted from all other values. Values were converted to percentages for comparison with control treated with only CsESP. Values are presented as means±SE of 3 independent experiments (*P<0.05, compared with the ESP only-treated control).

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Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells

Primer sequences for amplification of TLR isoforms by RT-PCR

Gene name Direction Primers Amplicon size (bp)
TLR1 Forward 5′- CGTAAAACTGGAAGCTTTGCAAGA -3′ 890
Reverse 5′- CCTTGGGCCATTCCAAATAAGTCC -3′
TLR2 Forward 5′- GGCCAGCAAATTACCTGTGTG -3′ 615
Reverse 5′- CCAGGTAGATCTTGGTGTTCA -3′
TLR3 Forward 5′- ACATCCCTGAGCTGTCAAGC -3′ 320
Reverse 5′- CCGCCTCAAAGTCCCTTTCT -3′
TLR4 Forward 5′- CTGCAATGGATCAAGGACCA -3′ 623
Reverse 5′- TCCCACTCCAGGTAAGTGTT -3′
TLR5 Forward 5′- CATTGTATGCACTGTCACTC -3′ 486
Reverse 5′- CCACCACCATGATGAGAGCA -3′
TLR6 Forward 5′- TAGGTCTCATGACGAAGGAT -3′ 1,108
Reverse 5′- GGCCACTGCAAATAACTCCG -3′
TLR7 Forward 5′- AGTGTCTAAAGAACCTGG -3′ 545
Reverse 5′- CTTGGCCTTACAGAAATG -3′
TLR8 Forward 5′- CAGAATAGCAGGCGTAACACATCA -3′ 637
Reverse 5′- AATGTCACAGGTGCATTCAAAGGG -3′
TLR9 Forward 5′- TTATGGACTTCCTGCTGGAGGTGC -3′ --
Reverse 5′- CTGCGTTTTGTCGAAGACCA -3′
TLR10 Forward 5′- CAATCTAGAGAAGGAAGATGGTTC -3′ 659
Reverse 5′- GCCCTTATAAACTTGTGAAGGTGT -3′
Table 1 Primer sequences for amplification of TLR isoforms by RT-PCR

Table 1

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