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MicroRNA expression profile in the third- and fourth-stage larvae of Angiostrongylus cantonensis

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Abstract

The pathogenesis of angiostrongyliasis, resulting from the third-stage and the fourth-stage Angiostrongylus cantonensis larvae invasion of the human central nervous system, remains elusive. MicroRNAs are important regulators of gene expression and involved in many biological processes. The aim of this study was to determine and characterize miRNAs of third (L3) and fourth (L4) larvae of A. cantonensis by Solex deep sequencing. A total of 629 conserved miRNAs (526 and 376 miRNAs in L3 and L4 larvae of A. cantonensis, respectively) and three novel candidate miRNA from L3 and L4 larva of A. cantonensis were identified with bioinformatic analysis. There were 163 miRNAs upregulated and 54 miRNAs downregulated (fold changes ≥5.0) in the L4 of A. cantonensis compared with that of L3 of A. cantonensis. Interestingly, Gene Ontology “biological process” classifications revealed that 26 miRNAs of significantly differential expression are associated with the immune system, which implies that these miRNAs might participate in the pathogenesis of angiostrongyliasis by regulating genes involved in immune response pathways. Furthermore, the differential expression patterns of 26 conserved miRNAs between L3 and L4 of A. cantonensis were verified. The results of real-time PCR and Northern blot showed that the aca-miR-124 and aca-miR-146a-5p have a low level expression in L3 larvae but high level expression in L4 larvae. Transfection of aca-miR-124 mimics alone significantly downregulated the mRNA expression of IL-6 and IL-1β and TNF-a in the N9 cells, compared to the combination transfection of aca-miR-124 mimics and inhibitor (P < 0.05), suggesting that miR-124 of A. cantonensis have an important role in the suppression of microglia activation. In conclusion, the study presents a general picture of the expression of small RNAs in L3 and L4 of A. cantonensis and highlights conserved miRNAs differentially expressed between L3 and L4 larvae. Our data revealed that miRNAs of parasite may mediate important roles in A. cantonensis immune evasion and aca-miR-146a-5p can serve as a potential biomarker to diagnose angiostrongyliasis.

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Acknowledgments

The study was funded by grants from the National Nature Science Foundation of China (81261160324, 81271855) and the National Basic Research Program of China (2010CB530004).

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Authors and Affiliations

  1. Key Laboratory of Tropical Diseases and Control, Ministry of Education, Guangzhou, People’s Republic of China

    Zhengyu Li, Xiaoguang Chen, Xin Zen, Jinyi Liang, Jie Wei, Zhiyue Lv, Xi Sun & Zhong-Dao Wu

  2. Department of Parasitology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, People’s Republic of China

    Zhengyu Li, Xiaoguang Chen, Xin Zen, Jinyi Liang, Jie Wei, Zhiyue Lv, Xi Sun & Zhong-Dao Wu

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  1. Zhengyu Li
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  2. Xiaoguang Chen
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  3. Xin Zen
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  4. Jinyi Liang
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  5. Jie Wei
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  7. Xi Sun
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Correspondence to Xi Sun or Zhong-Dao Wu.

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Zhengyu Li and Xiaoguang Chen contribute to this work equally.

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Li, Z., Chen, X., Zen, X. et al. MicroRNA expression profile in the third- and fourth-stage larvae of Angiostrongylus cantonensis . Parasitol Res 113, 1883–1896 (2014). https://doi.org/10.1007/s00436-014-3836-6

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  • DOI: https://doi.org/10.1007/s00436-014-3836-6

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