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Immunohistochemical study on the antigenicity of each organ structure of Clonorchis sinensis
Insights
This study investigated the antigenicity of the liver fluke, Clonorchis sinensis, using immunohistochemistry. The excretory and digestive organs showed the strongest antigenicity, suggesting key roles in immune responses.
Area of Science:
- Parasitology
- Immunology
- Biochemistry
Background:
- Clonorchis sinensis is a significant human liver fluke pathogen.
- Understanding the antigenicity of different parasite structures is crucial for developing diagnostic and therapeutic strategies.
Purpose of the Study:
- To comparatively analyze the antigenicity of various body structures of Clonorchis sinensis using immunohistochemistry.
- To identify body parts with the highest antigenicity for potential use in diagnostics or vaccines.
Main Methods:
- An indirect immunoperoxidase technique was employed on formalin-fixed, paraffin-embedded sections of C. sinensis.
- Pooled cat sera from experimentally infected cats served as the primary antibody, with peroxidase-conjugated goat anti-cat IgG as the secondary antibody.
- Optimal antibody dilutions were determined to be 1:1,000-1:2,000 for the primary antibody and 1:1,000 for the secondary antibody.
Main Results:
- The intestinal epithelial cells, intestinal content, and excretory bladder exhibited strong positive staining, indicating high antigenicity.
- Uterine wall, eggs, vitelline glands, and male reproductive organs showed weak positive reactions.
- Suckers, tegument, subtegumental cells, and parenchyma displayed no positive immunoperoxidase reactions.
Conclusions:
- The excretory and digestive organs of Clonorchis sinensis possess the most potent antigenicity.
- Excretory-secretory substances from these organs are likely major contributors to the parasite's antigenicity.
- These findings can inform the development of novel diagnostic tools and anti-parasitic interventions.
Abstract:
An immunohistochemical study was performed to demonstrate comparative antigenicity of each body structure of the liver fluke, Clonorchis sinensis, such as the digestive tract, reproductive organs, excretory system, tegument and suckers. Indirect immunoperoxidase technique was applied, using formalin-fixed and paraffin-embedded sections of C. sinensis as the antigen. Pooled cat sera obtained 10 weeks after an experimental infection with C. sinensis and peroxidase-conjugated goat anti-cat IgG were used as the primary and secondary antibodies, respectively. The intensity of immunohistochemical stain was very sensitive upon the titers of the primary and secondary antibodies, and their optimum dilutions were found to be 1:1,000-1:2,000 and 1:1,000, respectively. The intestinal epithelial cells, intestinal content and excretory bladder showed strong positive coloring reactions even at lower titer (1:2,000) of the primary antibody, whereas the uterine wall and eggs, vitelline glands, and male reproductive organs showed only weak positive reactions despite an increase in the antibody titer (1:1,000). On the other hand, the suckers, tegument, subtegumental cells and other parenchyma portions did not reveal any positive immunoperoxidase reaction at the same antibody titers. From the above results, it is highly suggested that the most potent antigenicity of C. sinensis occur from their excretory-secretory substances originated from the digestive and excretory organs.