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• W4225897211 abstract "Abstract Background Angiostrongylus cantonensis L5, parasitizing human cerebrospinal fluid, causes eosinophilic meningitis, which is attributed to tissue inflammatory responses caused primarily by the high percentage of eosinophils. Eosinophils are also involved in killing helminths, using the peroxidative oxidation and hydrogen peroxide (H 2 O 2 ) generated by dismutation of superoxide produced during respiratory burst. In contrast, helminthic worms have evolved to attenuate eosinophil-mediated tissue inflammatory responses for their survival. In previous study, we demonstrated the extracellular function of Acan -Gal-1 in inducing the apoptosis of macrophages. Here, the intracellular functions of Acan -Gal-1 were investigated, aiming to further reveal the mechanism involved in A. cantonensis L5 worms surviving inflammatory responses in the human central nervous system. Methods In this study, a model organism, Caenorhabditis elegans , was used as a surrogate to investigate the intracellular functions of Acan -Gal-1 in protecting the worm from its host’s immune attacks. First, structural characterization of Acan -Gal-1 was analyzed using bioinformatics; second, qRT-PCR was used to monitor the stage specificity of Acan-gal-1 expression in A. cantonensis . Microinjections were performed to detect the tissue specificity of lec-1 expression, the homolog of Acan-gal-1 in C. elegans . Third, microinjection was performed to develop Acan-gal-1::rfp transgenic worms. Then, oxidative stress assay and Oil Red O fat staining were used to determine the functions of Acan -Gal-1 in C. elegans . Results The results of detecting the stage specificity of Acan-gal-1 expression showed that Acan -Gal-1 was upregulated in both L5 and adult worms. Detection of the tissue specificity showed that the homolog of Acan-gal-1 in C. elegans , lec-1 was expressed ubiquitously and mainly localized in cuticle. Investigating the intracellular functions of Acan -Gal-1 in the surrogate C. elegans showed that N2 worms expressing pCe-lec-1::Acan-gal-1::rfp , with lipid deposition reduced, were significantly resistant to oxidative stress; lec-1 mutant worms, where lipid deposition increased, showed susceptible to oxidative stress, and this phenotype could be rescued by expressing pCe-lec-1::Acan-gal-1::rfp . Expressing pCe-lec-1::Acan-gal-1::rfp or lec-1 RNAi in fat-6;fat-7 double-mutant worms, where fat stores were reduced, had no significant effect on the oxidative stress tolerance. Conclusion In C. elegans worms, upregulated Acan- Gal-1 plays a defensive role against damage due to oxidative stress for worm survival by reducing fat deposition. This might indicate the mechanism by which A. cantonensis L5 worms, with upregulated Acan- Gal-1, survive the immune attack of eosinophils in the human central nervous system. Graphical Abstract" @default.
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• W4225897211 date "2022-02-05" @default.
• W4225897211 modified "2023-10-01" @default.
• W4225897211 title "Upregulated galectin-1 in Angiostrongylus cantonensis L5 reduces body fat and increases oxidative stress tolerance" @default.
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• W4225897211 doi "https://doi.org/10.1186/s13071-022-05171-4" @default.
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