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Recombinant dynein light intermediate chain of Haemonchus contortus affects the functions of goat immune cells in vitro

  • Immunology and Host-Parasite Interactions - Original Paper
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Abstract

Haemonchus contortus dynein light intermediate chain (HcLIC), an essential excretory/secretory protein of Haemonchus contortus, has been shown to have antigenic features. Neverthless, understanding of its immunomodulatory roles on host immune cells remains limited. Herein, HcLIC gene was amplified by polymerase chain reaction (PCR) and cloned in prokaryotic expression vector pET32a. The protein was expressed by IPTG and purified by affinity chromatography using HisTrap™ FF column. The localization of HcLIC in adult H. contortus woms was detected by immunohistochemical analysis. Immunofluorescence assay (IFA) was carried out to test the binding ability of rHcLIC to goat peripheral blood mononuclear cells (PBMCs). Furthermore, the effects of HcLIC on cell migration and cell apoptosis were evaluated when goat PBMCs were co-incubated with rHcLIC protein. The results revealed that rHcLIC was expressed in the cuticle tissues of adult H. contortus. IFA confirmed the binding of HcLIC on the surface of goat PBMCs. Moreover, functional analysis revealed that the interaction between rHcLIC and host immune cells significantly suppressed cell migration, suggesting that parasite might lessen the production of cytokines and chemokines that signal the migration of host immune cells towards infection site. Moreover, rHcLIC treatment improved cell apoptosis efficiency which might lower the immune cells quantity and thereby downregulate host immunity, enabling parasite survival within host. These results suggested that decrease trend of migration along with induction of apoptosis might be an immunosuppressive strategy of H. contortus. Overall, these findings add to our understanding of HcLIC, and the mechanisms involved in H. contortus immune escape during host-parasite interaction.

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Funding

This work was funded by the National Natural Science Foundation of China (31872464 and 82160395), the National Key Research and Development Program of China (2017YFD0501200), the Natural Science Foundation from Jiangsu Province (BZ2019013), and the project of State Key Laboratory of Pathogenesis, Prevention and Treatment of High Incidence Diseases in Central Asia, Xinjiang Medical University (SKL-HIDCA-2021- JH7).

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Correspondence to Ruofeng Yan.

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The authors declare no competing interests.

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Section Editor: Abdul Jabbar

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Aimulajiang, K., Wen, Z., Khand, F.M. et al. Recombinant dynein light intermediate chain of Haemonchus contortus affects the functions of goat immune cells in vitro. Parasitol Res 121, 1699–1707 (2022). https://doi.org/10.1007/s00436-022-07510-x

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  • DOI: https://doi.org/10.1007/s00436-022-07510-x

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