NDLI: Fasciola gigantica tegumental calcium-binding EF-hand protein 4 exerts immunomodulatory effects on goat monocytes

Content Provider	Springer Nature : BioMed Central
Author	Ehsan, Muhammad Hu, Rui-Si Hou, Jun-Ling Elsheikha, Hany M. Li, Xiao-Dong Liang, Pan-Hong Zhu, Xing-Quan
Abstract	Background The liver fluke Fasciola gigantica secretes excretory-secretory proteins during infection to mediate its interaction with the host. In this study, we investigated the immunomodulatory effects of a recombinant tegumental calcium-binding EF-hand protein 4 of F. gigantica (rFg-CaBP4) on goat monocytes. Methods The rFg-CaBP4 protein was induced and purified by affinity chromatography. The immunogenic reaction of rFg-CaBP4 against specific antibodies was detected through western blot analysis. The binding of rFg-CaBP4 on surface of goat monocytes was visualized by immunofluorescence assay. The localization of CaBP4 within adult fluke structure was detected by immunohistochemical analysis. The cytokine transcription levels in response to rFg-CaBP4 were examined using ABI 7500 real-time PCR system. The expression of the major histocompatibility complex (MHC) class-II molecule (MHC-II) in response to rFg-CaBP4 protein was analyzed using Flow cytometry. Results The isopropyl-ß-D-thiogalactopyranoside-induced rFg-CaBP4 protein reacted with rat sera containing anti-rFg-CaBP4 polyclonal antibodies in a western blot analysis. The adhesion of rFg-CaBP4 to monocytes was visualized by immunofluorescence and laser scanning confocal microscopy. Immunohistochemical analysis localized native CaBP4 to the oral sucker, pharynx, genital pore, acetabulum and tegument of adult F. gigantica. Co-incubation of rFg-CaBP4 with concanavalin A-stimulated monocytes increased the transcription levels of interleukin (IL)-2, IL-4, interferon gamma and transforming growth factor-β. However, a reduction in the expression of IL-10 and no change in the expression of tumor necrosis factor-α were detected. Additionally, rFg-CaBP4-treated monocytes exhibited a marked increase in the expression of the major histocompatibility complex (MHC) class-II molecule (MHC-II) and a decrease in MHC-I expression, in a dose-dependent manner. Conclusions These findings provide additional evidence that calcium-binding EF-hand proteins play roles in host-parasite interaction. Further characterization of the immunomodulatory role of rFg-CaBP4 should expand our understanding of the strategies used by F. gigantica to evade the host immune responses. Graphical abstract
Related Links	https://parasitesandvectors.biomedcentral.com/counter/pdf/10.1186/s13071-021-04784-5.pdf
Ending Page	15
Page Count	15
Starting Page	1
File Format	HTM / HTML
ISSN	17563305
DOI	10.1186/s13071-021-04784-5
Journal	Parasites & Vectors
Issue Number	1
Volume Number	14
Language	English
Publisher	BioMed Central
Publisher Date	2021-05-22
Access Restriction	Open
Subject Keyword	Parasitology Entomology Tropical Medicine Infectious Diseases Veterinary Medicine Veterinary Science Virology Fasciola gigantica Tegumental calcium-binding EF-hand protein 4 Immune responses Monocytes Host-parasite interactions Veterinary Medicine/Veterinary Science
Content Type	Text
Resource Type	Article
Subject	Veterinary Infectious Diseases Parasitology
Journal Impact Factor	3/2023
5-Year Journal Impact Factor	3.3/2023

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